Can I use multiple overseas warehouses with my OMS account at the same time?
Yes, here is the guide on use multiple warehouse with your OMS account.
2. Select the warehouse you want to grant rights to
3. Click Client Center. Then, click on Invite, as shown below:
4. Choose a Method to use

A. Entering Contact Info - put in the email address you wish to invite and click on Send Invitation Email
B. Copy the link and send to the client - copy link and your send it directly to the client.