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Hello @Sarah,
Thank you for contacting Microsoft Community.
To keep your calculation ranges fixed while allowing the criteria cell to change as you drag the formula down, you can use:
=SUMIF('Invoices 26-27'!$F$48:$F$75,C1,'Invoices 26-27'!$J$48:$J$75)
The $ signs keep the ranges fixed, while C1 automatically changes to C2, C3, and so on when you drag the formula down.
Regarding your monthly updates, you could also consider using an Excel Table, which automatically expands when new rows are added, reducing the need to adjust your formula ranges manually.
To recommend the most suitable approach, could you please confirm whether you add new invoice rows to the same worksheet each month or create a separate worksheet for every month?
I hope this helps.
Best regards.