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Go to Finance → Fee Structures → New Structure.
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Pick the academic year and term.
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Choose the target classes, and add lines: fee item + amount + optional class/section/boarding/individual-student targeting.
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Save as Draft while you're still editing — only Active structures can generate invoices, and only Draft structures can still be edited.
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Once you're happy with it, Activate the structure.

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Click Generate Invoices, and set an issue date and due date.
Every enrolled student matching the structure's lines gets one invoice automatically — running this twice won't double-bill a student who already has an invoice from that structure.