Two ways to give the customer a choice on a quote:
Optional extras
Mark a line as optional and the customer ticks it on or off. The deposit and the final invoice bill only the required lines plus whatever they chose.
Good / better / best
Group alternative lines so the customer picks exactly one — for example three tiers of the same job. The money everywhere (deposit, schedule, invoice) follows the choice they made.
Good to know: Selections lock at acceptance, so the agreed price is exactly what they picked.