Hi Blake C,
The best way to create the filters for the grid on the new page is by first opening up the grid object in the designer for the specific page by clicking on the Edit link.
In Step 3 of 9: Filters, on the wizard, you can then click on the New/Edit button, and select the New View option. On the original wizard, you can then select a filter from the dropdown for "Choose from a list of available fields" and then click on the Insert Filter... button which will give you additional options for that specific filter.
If you would like to have the filter behave like one of the "Shared" filters on an existing grid, you can open up an existing grid and select a filter starting with the "Shared" title, and view how the fields are filtered.
The one common filter that you would see on the grids for those screens for the filters that are shared is filtering for "SalesRepRecordID" field. I would review those and add additional filters that you would want to add to the shared filters.
I hope that this helps.
Ronen