I would like to merge AVol's Bastila Shan for PC with stoffe -mkb-'s Handmaiden Looks mod. Unfortunately they both add lines to the apperance.2da. Can I add a new line under the Bastila lines and still have the handmaiden mod work.
If you mean the mod (
http://www.algonet.se/~stoffe/maidenlook.rar) that changes the Handmaiden's white leather outfit a bit and makes her look different from her half-sisters, then it should come with a mod installer that automatically alters the appearance.2da file when you install it.
So, just make sure you install the Bastila mod first, then run the installer that came with the handmaiden mod and it should deal with any necessary 2da editing for you (and update any 2DA references in templates to point to the correct new line numbers that have been inserted).