Create a new Department for the system using Sentinel, giving it the name you wish.
In the channels screen, (the right pane), click the green + symbol to add a new channel. With Sentinel still open, go to the other program, select the talkgroup data using standard mouse actions. Use the Copy function. Then go back to Sentinel and paste the copied items. While you may have added but one channel, when you paste additional channels are created for all you selected. You may have to do this column by column.
Then save the Favorites List and program to your scanner.
(It took me a few tries to do this at first.)