You are able to attach a spouse to your client. This can be any other client in the system. To get started make sure both clients already exist in the system. If so then you can select from the client list one of the clients you are looking to add a spouse for. When the details load you will see a red Set Spouse link in the personal details.

Once you click Set Spouse you will have a popup which allows you to select any client in the system. Click the select button to attach the spouse. Once the popup closes make sure you hit the blue Save Details button