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Blocking one task or another task only works as part of an outline in a single project in OF. The options that I can think of are making project 1 and project 2 a single project; or making yourself a note to manually make project 2 active at some point in project 1.

Oh, also: I personally don't use it, but omniplan is probably more analogous to MS Project.

Last edited by Lucas; 2012-01-29 at 10:10 AM..