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Log in to your Slack workspace through the **Slack app** or the **web browser**.
On the left sidebar, locate and click on the **Channels** section to view your existing channels.
Click on the **+** icon next to **Channels**. Select **Create a channel** from the dropdown menu.
Fill in the **channel name** and **description**. Ensure to select the option for **Make this channel shared** if you want to invite another company.
After creating the channel, click on **Invite people**. Enter the email addresses of the external members from the other company to invite them to the channel.