Combining Assets

While trying to figure out how to get rid of my shiny assets I came across another problem.

And I know it's something that I should never have done but I haven't been using Unity or Maya for the past few projects and I just forgot the routine I needed to follow.

To be more specific, I completely forgot to combine my assets. A lot of the bits and pieces I was making separately and in the end I exported it that way...

I realized a great way into building the environment so it took me a while to combine every single thing and export them again but in order to sort out other problems it had to be done. 

Also in a long run saved me a lot of time, because later on when I was moving things around and placing them exactly where they needed to be I could easily maneuver them around. 

I felt so stupid that I've done that but since then I didn't make the same mistake. I got into the routine again of combining pieces, freezing transformations, deleting the history and then exporting the asset.