Take A List And Reorder It In Column Form

I figure the before/after image would be best to describe what I need. I have various sections of data saved in this one spreadsheet which a program reads from for comparisons.

Right now they are in a list form like this:

Now the end result I want to look like this. Basically take the items in the column, and add the items selected next to it, one in each column not including itself of course.

These are basically the comparables, example this list would be "car manufacturers", and below that in cell A7 I might have another list started that has to do with "motorcycle manufacturers" etc

The end result would give a row of all possible combinations. The app we use pulls from the rows so it needs to have all of the items that are comparable in there and I can't seem to find a way in which to do this.

Hopefully this is understandable when you see what I manually did (unfortunately I need to do this for about 4000 entries, a few hundred groups of different characteristics).