Import files in the same layout as it was saved

A lot of my prints include multiple duplicates (sometimes as many as 60 items). It is so annoying when I want to combine two separately saved builds (which I have previously duplicated and aligned). When I import a file to join another, I get what could be 60 items just scattered across the build which I then have to spend ages realigning.
Perhaps there is a way around this I’ve missed?
Is there also a way in Preform to just create an array of an item in rows, again, instead of in a scattered fashion?