This is a common application for electrical, plumbing and HVAC. Add drops that vary in length at each instance.
How to add Linear Drops
Start a linear takeoff.
When you are ready to add a drop, hold the L key and click the location of the drop.
Enter the length of the drop.
Use enter or click the check button to complete the drop.
Repeat the process for additional drops.
Delete a Linear Drop
With the linear takeoff selected and stopped, click on the drop.
Use the delete key or delete from the options drop down.