[agracier]

Isn't it able to add the missing parts to the map??

Not that i know ... it's best and probably far easier to start from zero and make a whole new map.Making a map up to the point of populating it with objects for towns, villages, bases and other things is not that long a job.

Populating is a long and time-consuming job.

Stitching 2 maps together is something I'm not even sure can be done at all ...