There is a command IMPTXT to import coordinates from .txt file in BabaCAD. BabaCAD is still 2D only (3D version is on the way) and there is no Z coordinate. Depth can be imported only as labels, so .txt file has to looks like (Depth first, then X and Y):
800.0 10.0 20.0
790.0 15.0 22.0
After IMPTXT you will get 2D points (10,20) and (15,22) labeled with 800 and 790.
(All row values in .txt file have to be delimited by TAB).