Posted by dellus on Jul 26, 2020; 8:12pm
URL: https://forum.librecad.org/File-created-a-plan-view-when-opened-now-I-cannot-delete-modify-trim-or-modify-It-is-acting-like-an--tp5719300p5719305.html

In the Block List there is "save the active block to a file"(floppy symbol). Then you can import the file as a block.
Another possibility could be to delete the contents of Project 1 but keep the blocks, resave it as Project 2 and use it as template for a new drawing. Haven't tested it, but should work.