Let visitors pick a time slot and remove it when the quota is filled.
Event sessions
Keep each session within capacity while the rest of the form stays open.
Volunteer roles
Stop assigning a role after enough people have selected it.
Simple inventory choices
Use option quotas when each selected choice consumes one unit.
Set up choice limits with FormGuard
Add your multiple-choice, checkbox, or dropdown question in Google Forms.
Open FormGuard from the Google Forms add-ons menu.
Turn on Choice eliminator.
Set the quota for the supported question.
Save settings and test the form with a sample submission.
For quantity-based sales, such as one response buying three units, a simple choice quota may not be enough. Test the workflow on a copy before using it for live inventory.
Use choice limits with response limits
Choice limits can run alongside a total response limit. A form can close when total capacity is reached while individual options are removed as they fill.