You shouldn't need to, the eb multiplayer edu is stored in EB\mp custom game edu, IIRC the two edus are identical, just rename one of them EXPORT_descr_unit and place it in the EB\data (don't forget to back up your single player EDU)

Note. you can not play multiplayer on BI, if you are using BI and don't know how to run custom battles then just copy your EB shotrtcut and delete the -BI addition from RomeTW-BI.exe