Setting up Contingency Logic in MS Project

[labtrckr]

I have 4 tasks that all have different predecessors, that cannot run in
parallel. Is there a way to set them up to start dependent upon the
predecessors and also when the first of the other 3 completes (it may not
always be the same order). Kind of like, once one starts the other has to
wait until it finishes, but can start if the other has not yet started?

 

[Jack Dahlgren MVP]

There is no built-in method to do this, but you can approximate the function
using some VBA coding. I have an example of this here:
http://masamiki.com/project/macros.htm
Look at the "Follow earliest predecessor" section