sorry for the repost.. i need help

I did this about a week ago and I cant for the life of me remember how to do this. I have a long recording that I am chopping up into individual tracks. I placed markers where I want songs to end/begin and I cant remember the keyboard shortcut to turn the areas in between 2 markers into regions. I know Command>shift>R creates a new region but there was another shortcut that would turn the areas in between the markers to the new region by clicking btween them, etc. I could try to do it manually but sometimes they are off, especially in a DJ mix. PLEASE HELP.

Thank you in advance.