How can I Creating Single Payment for Multiple Supplier Sites

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How can I Creating Single Payment for Multiple Supplier Sites

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We 50 schools and One School District (corp office).

We have Utility Vendor (Gas) providing service to all locations.

Each location has gas meter and Vendor send one invoice for each location with meter number to school district.

School district creates the AP invoices and distribute the expense to each location by meter number.

We created Multiple vendor sites and each site has distribution sets based on cost center.

When we scan invoices, IDR reads site name and creates invoice with distribution set and this is saving lot of time for AP users to create invoice with distribution accounts but when we print check, PPR is not grouping payment by Vendor