making multiple pieces as one group?

I have selected all pieces and want to make as one, but i can not seem to do it. No doubt an easy way but got me stumped

What are the pieces you are trying to put together? Keep in mind that building pieces are divided between on-grid pieces and off-grid pieces. Every time you place a new on-grid piece outside of a group, it creates a new building, and you can't merge two buildings into one group. The best you can do in this case it merge them as a blueprint, but even then when you place them they will still be separate groups per building.
 
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