# Dynamic group links With dynamic group links, bookers can dynamically create group links by adding users using `+` between their usernames. {% embed url="" %} This feature allows you to append virtually unlimited number of Cal.com users by simply adding their usernames with a `+` between adjoining usernames, and have a collective group. Try it now with Bailey and Peer, visit This is an opt-in feature where a cal.com user can enable/disable if they wish to participate in this and allow the bookers to add them as part of a dynamic collective group.