5. Extras & mandatory fees
An extra is anything sold on top of the cabin: nitrox, equipment rental, a course — or a mandatory fee every guest must pay, such as a marine park entrance fee.
In short:
- Optional extras: create them in Product Setup › Extras with a price and a calculation type (per person, per day…). Guests pick them when they book.
- Mandatory fees: tick Mandatory. For a park or entrance fee, choose the financial category Park fee: DiveHQ then makes it mandatory, paid on board, not included in the price and not commissionable.

Everything else — on-board payment, which trips get the extra, per-trip prices — is in Extras & mandatory fees.
Next: 6. Policies & payments
