Green means it is working on something.
Yellow means it is waiting for your input.
Red means there has been an error and something needs to be done with it.
Black and white means all is done.

If plugin file name is plaa.esm, just type in plaa.
Or unga bunga.esp, just type in unga bunga.
But leave file extension .esm, .esp or .esl out.

1. In Creation Kit. Choose File, choose Data…, select only mod you want to process, for example BTInteriors_Project.esp (check it) and then select OK.
NOTE: No need to set active plugin or select any others. Just press OK.
2. When loading is complete: Select File, select Data..., select only mod you want to process, for example BTInteriors_Project.esp. Choose Details..., choose Yes, tap keyboard combination SHIFT+CTRL+B and choose Yes.
NOTE: No need to press + sign. That only signifies that these keys need to pressed at the same time.
3. Then choose Close, choose Cancel and close Creation Kit.

If plugin file name is plaa.esm, just type in plaa.
Or unga bunga.esp, just type in unga bunga.
But leave file extension .esm, .esp or .esl out.

1. In Creation Kit. Choose File, choose Data…, select only your mod, for example Best_override_ever.esp (check it) and then select OK.
NOTE: No need to set active plugin or select any others. Just press OK.
2. When loading is complete: Select File, select Data..., select only your mod, for example Best_override_ever.esp. Choose Details..., choose Yes, tap keyboard combination SHIFT+CTRL+B and choose Yes.
NOTE: No need to press + sign. That only signifies that these keys need to pressed at the same time.
3. Then choose Close, choose Cancel and close Creation Kit.

Best_override_ever.esp (your override).
Best_override_ever - Geometry.csg (compressed spatial geometry database).
Best_override_ever.cdx (cell resource index file list).
Best_override_ever – Main.ba2 (compressed archive with Previsibines files in it).

• UrbanFoodExpanded.esp
• SOTS.esp (completely FUBAR. Please use this instead)
• InsideJobs.esp (delete Cell\Block 4\Sub-Block 4\tbRaidersDigestHQ from your plugin before processing it)
• Stm_DiamondCityExpansion.esp (completely FUBAR)
• probably any custom merge created with zMerge
• ESL plugins (more information below).
  

When we copy a record from ESL flagged plugin into a regular plugin with FO4Edit, its FormID gets "remapped" into low "normal" FormID number. In most cases, this will turn copied record into an override of a vanilla record because its low FormID numbering.

In mild cases copied record FormID collides and overrides something small, like a CarryWeight which just causes irregularities (non-functioning scripts, quests etc.). Worst cases it overrides PlayerCharacter (0x00000007), which causes game not to even start. And in catastrophic cases copied record overrides NPC perk or other attributes (luck, strength etc.) and after this broken record gets "distributed" everywhere with leveled lists and causes random CTDs when random NPC (raider, turret etc.) is spawned.

• BUM.esp
• Rsiyo'sLocationPack.esp
• Atomic World.esp (*)
• Cannibal.esp (*)
• CrimeTown.esp
• GoodneighborExpanded.esp
• Immersive_Lexington.esp (from Optimization Patches Collection)
• DWUK_LexingtonInteriors.esp (*)
• JalbertBrotherSettlement.esp
• RynsFallout4.esp
• Hunkered Down No AtomCatsGarage.esp
• WelcometoGoodneighbor.esp
• BTInteriors_Project.esp
• RailroadRedone.esp
• Commonwealth Underground and Forgotten Spaces2.0.esp (*)
• brotherhood of steel overhaul.esp
• SuperMutantRedux.esp (No AWKCR version)
• RaiderOverhaul.esp (No AWKCR version)
• NEST_BUNKER_PROJECT.esp (but from Optimization Patches Collection) (*)
• subwayrunnnerdynamiclighting.esp
• FallonsBasementOverhaul.esp
• moreXplore.esp (from Optimization Patches Collection)
• SalemEXPANDED.esp (from Optimization Patches Collection)
• HagenEXPANDED.esp (from Optimization Patches Collection)
• The Metro.esp
• Raider Children and Other Horrors of the Commonwealth (*)
• stumbleuponinteriors.esp
• MutilatedDeadBodies.esp (from Optimization Patches Collection)
• 0_Vault120.esp
• TheSewers.esm (*)
• CombatZoneOverhaul.esp
• ImmersiveGunnersPlazaExterior.esp
• ImmersiveGunnersPlazaInterior.esp
• TerrainUndersides.esp
• Simple_lighting_Merge.esp (see more information about this plugin from article: Completely optional. Introducing: Version Control Merge - Not so handy replacement for zMerge.)
  

When override is processed, Creation Kit assumes that override is the owner of empty root cell, because root cell data is not pointing to a master as a reference, and then fills missing records. But since cell already contains temporary and persistent objects as references from a master, it creates unusual situation where Creation Kit “interprets” object references so that override is the owner of them (even they are references). On these kind of cells, when processed, PreVisibines data will point in to a wrong plugin (override) and Creation Kit creates duplicate, “ghost”, CELL and WORLDSPACE records that overrides original master data. In-game this causes graphical anomalies and in worse case CTD.

• Grass or flora mods: these are procedurally generated and therefore has nothing to do with Previsibines.
• Tree mods: trees seems to not work at all with PreCombines.
  

NOTE: You can process tree (for example A Forest), flora and grass (for example True Grass) or other shrubbery (for example commonwealth conifers) mods, but PreVis will create strange visual effects when looking trough branches, or walking trough or past a bush. FPS gain is there (+2 to even +12), but it is not worth it because visual glitches.

• Landscape mods: these mods do not seem to have anything to do with Previsibines.
  

• LOD mods: these usually do not contain any data that can be used in the process.
• Weather mods: these usually do not contain any data that can be used in the process.
• Utility mods: (companion tweaks, AI tweaks, Canary save game monitor,  etc).
• Beautification mods: (Hairdos, HiPoly Faces, etc).
• NPC or creature mods: (ghouls, kids, gunners, etc).
• Object mods: (weapons, ammo, armour, etc).