Does anybody know how to create a block definition by using existing blocks? What I want to do is insert a block, explode if necessary, and add it to a newly created block def. Then insert a different block and add it to the new def, until I have a complete assembly of parts that I use to create the overall block. I have gone through the .ADDDXXX methods, and there are not any for blocks, but there is 1 for MInsertBlock, which I think I could use, but wanted to ask before I go down that path