Hi there @Rasangika,
Unfortunately, the current Slack integration does not include a "Find Group ID" action. I suggest reaching out to our Support Team to request this feature. You can contact our Support Team here: https://zapier.com/app/get-help
In the meantime, if you are familiar with API, you can use the API Request (Beta) action as a workaround. You can refer to this API documentation from Slack: https://api.slack.com/methods/usergroups.list
Alternatively, you can also use Custom Actions as a workaround and utilize the "Create with AI Builder" for the AI to create the custom action for you. More information about this can be found here: https://help.zapier.com/hc/en-us/articles/16277139110157-Create-a-custom-action
Please note that the workarounds mentioned are considered advanced features, so our support for them may be more limited. This is not because we don't want to help, but because troubleshooting APIs can be tricky due to the differing structures of each API and not having visibility on the other end.
If you need personal help setting up the workaround, you can reach out to one of our certified Zapier Experts here: https://zapier.com/experts
Hopefully, this helps!