Hello! I have a library of ready-made blocks and would like to know is there any lisp to filter my entire library in AutoCAD, so that has me a command that requests a block of workspace to exchange for another in a specific directory. Example: I have 5 base cabinets in dwg, however I have to replace 2 of these 5 base cabinets to high, so I activate a command and he calls me the blocks to be exchanged, I select the two blocks that I want to change and I enter in then appears a list (preferably an exclusive list that only has option for cabinets) to choose the block where I want to replace the selected, then I choose and I enter, enter to give the 2 base cabinets were exchanged for 2 high. I need this tool for working with several large projects that, if I have to swap one block with another seje not so laborious having to delete one by one and then insert the new. Since now I thank you!