Delay Until

Setting a delay on a plan item ensures that it won't start before a specific date.  You can set a "delay until” date in the Options area within the the edit pane: 

The “delay until” date is shown in the Projects view by a black triangle:

Remember that when the delay date arrives, your delayed item may not be scheduled to start that day if you still have higher priority work on your plate at that time. 

Automatic "flow-around"

In the example above, take a look at the tasks that were originally scheduled to happen after the one that's now delayed.  Since there is no hard dependency between the higher priority delayed task and the following work,  LiquidPlanner brings the following work forward on the time-line to prevent you from having an idle gap in your schedule.    

Don't miss these other scheduling options: setting a deadline date, putting an item on hold, and setting the max effort for a plan item.