A saved Supplier  profile will look like (as soon in figure)

Now scroll down to address section and click on "New Address" (as shown in figure)

Once you click on new address button a new address creation window will open (as shown in figure)

Enter the following details of your customer and save it.

• Address Title: Fill "Address Title" for your quick reference if that supplier has multiple location from which you receive purchase bills, other wise system will autogenerate title if you leave it empty
• Address Line 1 & 2: Detailed Address of this Supplier/Company. These address details will appear as entered on the sales invoice print of the customer
• City/Town/State/PIN Code: Enter these details as per the details given by the supplier
• Party GSTIN - Enter GSTIN number as per the GST registration details of the supplier you have received 
• GST State - Enter the GST registration state of that supplier
• Preferred Invoice Type - For all customers based out of India select "Regular", for all customer based out of India but registered in a Special Economic Zone select "SEZ" and for all customers based outside of India select "Export / Import"

Note: Based on this Preferred Invoice Type, GST tax templates for GST calculations will be applied automatically in purchase invoice

Once you have entered all the details, click on save.  

Your supplier would be successfully added in the system