To add default price list to the customers, please follow the below mentioned steps,
Step 1. Go to Customers from the home page, and click on Edit for the customer for whom you are adding pricelist.
Step 2. Click on More Details?
Step 3. Click on to Price List and select the pricelist, and click on Save to save the update.
Now when you select the customer while creating invoice the pricelist will be selected by default.


