Hi Patrick,
Since the relationship between Product and Quote line is N:1, we can use the calculated field to show the Product field value on the Quote line form.
In my environment, there is a field 'Current Cost'. I would like to display this field value in the Quote line form.
In the Quote line entity, create a calculated field, set its Action to productid.currentcost.
Add this calculated field to the Quote line form.
Go to Quote, add a Quote line. When I select the product and save it, the calculated field on the Quote line form will diaplay the value of field 'Current Cost'.
In this case, Quote line gets the value of the cost filed value of the Product.
In addtion, you could create another field of Quote line entity and use business rule to automatically calculate the total cost of multiple Quantity.
Please refer to this theme for details:
https://community.dynamics.com/365/sales/f/dynamics-365-for-sales-forum/370224/add-custom-field-to-quote
