importing a deep directory structure

hi all....

I looked real hard on the arch wiki, but can't find how I can import a 
dep tree with hundereds of files into a base version.

tla import doesnt work, can anyone tell me how I can import a source 
tree with a lot of files any directories into a branch without having to 
tla add-id each file individually? Isn't there any builtin command or 
script for this?

Thanks
Spundun