Mod dependent on other mod files?

[SkullKnight]

I'm new to making my own mods, and I've run into a problem. I'm trying to make a .esp mod thats dependent on two other files, and it refuses to work. Here is the setup I'm trying to achieve:

 

A.esp

B.esp

C.esp <-- optional feature that uses data from A and B

 

I'm able to create the C.esp file by loading A.esp and B.esp into the construction set, setting no active file, then creating content and saving as a new file. However, whenever I try to load C.esp, CS tells me that data is missing (the scripts, packages, items from A.esp and B.esp) when its obviously available. When I load C.esp in oblivion, the load bar just sticks and doesnt move. This error occurs even if A.esp and B.esp load before C.esp. I even tried using Tes4Edit to set A.esp and B.esp as masters of C.esp, but to no avail. At this point, I'm running out of solutions.

 

I saw something in the CS wiki that says .esp files can't modify content from other .esp files, but I've seen it done in other mods (maybe with a different tool?). I hope I made my problem clear, and any help with this would be appreciated.

[Tomlong54210]

TESCS De-Isolation tutorial - http://cs.elderscrolls.com/constwiki/index.php/De-Isolation_Tutorial