This is also, one of my favorite features! (I have so many favorite features! I don’t know why?! Or maybe I do! I just love InDesign! :D) There is fast and easy way to transform selected object and create duplicate.
So, how to do it? It’s really easy. All you need is Alt (PC) / Opt (Mac)! There are so many places where you can utilize this useful feature!
As you can see form screenshot, you can use it in Transform Panel/Control Tool Bar. Select object, input new value in X or Y field and hit Alt (PC) / Opt (Mac) + Enter. InDesign will automatically duplicate selected object and move duplicate by amount of units you entered! So easy!