To add the esm flag to an esp first you will need FNVEdit.
Launch FNVEdit and select the plugin you wish the add the esm flag to (Dummy esp.esp as the example) as shown below.

Click on the esp you wish to add the esm flag to click on file header and on the right side of FNVedit right click on the empty box beside record flag and click edit as shown below

After clicking edit a box should open with a list of option just click the box next to esm to add the flag and press ok.

After that close fnvedit and save changes and your esp file should know be flagged as a master.
A couple things I should note:
- This might break mods. I have comment telling me that NVB1 quest broke when adding flag however when I quickly checked for myself it seemed to be working fine as I was able to start quest and get to the bounty where you search around the highway north of the Mojave Outpost.
- I know this guide is badly written and hopefully I will come back later to fix this.
- I don't currently recommend adding the esm flag to esps as I stated before this might break mods however this is the way I know to get facegen to work for these mods.
- I use MO2 however the only difference if you are not using MO2 is that you won't run FNVEdit through MO2.
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