Hei Pamela @Pamela Miller‚ ,
This is not possible automatically, upto my knowledge. But we have to update progress of task in Projects B to which the task in Project A is connected. After connecting projects using Cross Project Predecessors, it does not update the planned start date & planned completion date. It only holds for one date either planned start or planned completion date. This type function is very much required in Workfront.
Mvh
Kundan.