Using Step and Repeat codes is an excellent way to reduce your gerber file sizes by up to 99% smaller. FAB 3000 database uses hierarchy and that makes it easy to create a step and repeat for any image.
1. Create your 1UP design that you wish to have step and repeated.
2. Create a new job or panel. (menu: File / New / Job)
3. Insert the job which contained your 1UP design and add array parameters. (menu: Job / Insert...)
That's it, you can created an arrayed insert (similar to a minsert in AutoCAD).
4. Now export to Gerber, ODB++, DXF or whatever format you desire.
Note: Make sure to check the option "Use Step and Repeat Codes" (if available for your format).
Here's a tutorial movie showing all steps: