[whpalmer4]

Jan,

have a look at the recent post to the Omni Mouth about multiple project support in OmniPlan.

The default in OmniPlan is to assign resources at 100% utilization which as you have noticed means you work on one thing until it is done, then go to the next. If instead you create multiple resources (even though they may be the same person in this case) where the availability is set to a percentage less than 100%, you'll see OmniPlan willing to assign multiple tasks. You might experiment a bit with creating 4 or 5 "me" resources, each at 25% or 20%, so you can see how multi-tasking might affect the schedule. By default, the effort will stay the same, but duration will expand, though certainly there are tasks for which this relationship isn't desired, and they can be addressed via the Task:Assignments Inspector.