> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://help.textit.com/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# Splitting by Group Membership

Route a contact through a flow's logic using a **Split by Group Membership** node. This will allow you to send customized messages to a contact depending on their groups.

For example, you could stop contacts who've already completed a previous registration flow, where they've already been added to a group, from restarting all over again:

![](https://storage.crisp.chat/users/helpdesk/website/-/7/a/9/f/7a9fc4558a9de000/screenshot-2026-04-29-at-09150_gjqmp9.png)
By splitting on the group membership, only contacts who aren't already added to the 'Completed Registration' group will continue in the flow. Those who are added to the group will receive a different message letting them know they've completed the separate registration flow.

You can [add or remove contacts](/en/article/adding-or-removing-contacts-in-a-group-9fkx32/) in a group either manually or via a flow.

Questions? Send us a message via the support widget in the bottom righthand corner.