Yes. Select Users is a multi-select, so you can attach several customer accounts to one proposal (for example a couple, or the household members of a Personal Chef plan). Every attached customer can open the proposal from their account, sign contracts, message you and pay. When you send the proposal you choose which of the attached customers receive the email (Select which customers), and when printing you choose which single customer the PDF is addressed to (Select which customer). Adding or removing customers on an existing proposal is recorded in the Activity log.