Let the client select several independent options in a proposal.
1. Add a checkbox
Open Content → Fields → Checkbox in the proposal editor. Place a checkbox beside each option, for example “Printed copy” and “Digital copy.”
2. Review the labels
Give each choice a clear label. Leave extras optional unless the customer must select them.
3. Test several choices
Save and preview. Check both boxes, then clear one. Verify the other remains selected.