Most of the time we want to base our start dates around an event that is in the middle of the project template. If I set a bar up at the date we want it, it doesn't move the predecessors up. Is there a way to change this? 

eg. there is no point starting the framing for a container home if the windows won't arrive for 3 months. I want to lock in that window delivery and have Projects adjust the Ps and Ds from that point.