Hi Agracier, what version of the game do you use ?
in my BAT 4.8.2 Flashpoint install, for the WWII module (#WAW3), the all.ini file is in the #WAW3\MAPMODS\Maps folder, I have added several maps without any issue.
For SCW maps , I suggest to add them in the #TGA3 module, the all.ini to update is in the #TGA3\MAPMODS\Maps folder .
I hope this can help.
Best regards
Stephane