Welcome, @Alyson_Rinaldi,
If you have dependencies set, first check Dependency management options and ensure Maintain buffer is set.
It is possible to select many tasks in timeline view (I just re-confirmed). On a Mac with a trackpad:
- Depress with thumb and keep down through all the following
- With forefinger drag (lasso) all visible tasks then raise up forefinger
- With a pair of fingers (besides thumb) scroll down
- Repeat last two steps above until done
- Raise thumb leaving all tasks selected
- Drag any one task one week forward to move them all.
If all tasks are connected with dependencies, you could just move the first one to be pushed out and Maintain buffer would move the rest.
Flowsana.net might help too (cc @Phil_Seeman).
Hope that helps,
Larry