I am having issues with this command, I do a lot of blocks and we do tremendous customization to most of them so block command is really not the one Id like to use, I just like to use group for these objects for the ease of moving them around swapping them etc. once I explode the blocks (wall assemblies etc.) it is ultra hard to keep hatches and things together... so grouping them would be perfect (or even join like in Rhinoceros), is there anything like that I can use or what would you recommend. I am a new user of AutoCAD LT 2018 and will appreciate all shortcuts and help! 

Warmly, 

Mila