Hi Barry9
I just new at the forum and I try to help you.
first please precise your problem. what do you want to import export. Then please information about your software.
please have a look at this series of videos this is very useful and makes librecad for me a handy tool.
Good luck
https://www.youtube.com/watch?v=53DOEKzL2rw&list=PLB9CB29692D89976A&index=1