In addition to standard information like phone and email, you can also pre-assign taxes or a Price Type. You can also set a default currency for the Client if you are using Multiple Currencies and/or an Avalara Tax Exemption Code if you have enabled Avalara Tax Integration.
You can choose to add a new Contact "from Scratch", add an existing Contact, or import Contacts from Outlook.
This option will create a Contact based off of the Client.
Once you've added a Contact or multiple Contacts, you can set one as the Primary Contact. The Primary Contact is added to SI Projects automatically when a Client is selected for a Project.