Secondary Priority applies to assembly component jobs only.  In an assembly structure if there are more than one component at a level, you can assign a priority called a secondary priority to the component jobs so that higher secondary priority component jobs get first chance at resources before lower secondary priority jobs.  The secondary priority can be from 1, the highest level, to 99, the lowest level.

For example, in the assembly example below:

Components D, E, D and G all share the same assembly level.  If we assign the secondary priority as follows:

       G has a secondary priority of 10

       F has a secondary priority of 20

       E has a secondary priority of 30

       D has a secondary priority of 40

Then G has the first chance at scheduling resources, then F, G, E and finally D has the last chance.