An ad-hoc pivot table over Projects — mirrors the old ImproveBuild desktop app's Analysis utility. One screen, 432 possible combinations, no report has to be pre-built.
Side menu → Cross-Tab Analysis. Choose a dimension for Row and one for Column (the same six choices are available for both):
Set Total Type (SUM, COUNT, or MAX) and Total On:
Set a date range (filters on Project Origin Date), then Run Analysis.
A grid with row/column/grand totals, plus a bar chart of the same data. Click any row to re-chart just that row as a pie breakdown by column — useful for drilling from "which Refer Type brings in the most Contract Amount overall" down to "...and which Project Types make up that one Refer Type's total."