To insert pipe risers and automatically coordinate the riser between multiple floors, go to
Ribbon: DM Plumbing->Pipes-> 
Insert Pipe Riser
Pulldown Menu: DM Plumbing->Pipes->Insert Pipe Riser
You will be prompted to identify where the pipe riser is to be inserted.
Specify location of riser:
Insert Riser Dialog Box
See the Common Pipe Flow Categories section for more information about the Pipe Types listed in this dialog box.
See the Common Riser Information section for details on the riser settings in this dialog box.
Enter the riser settings and press the OK button. The riser pipe will be inserted on the Starting Floor, the Ending Floor, and any floors in between.