The following occurs after you have entered prices initially in the price matrix page.
If you leave a price cell empty the client will not be able to order that configuration.
If you change/replace any quantity or parameter value the original price will hold to the new value.
If you add a new value to an existing quantity or parameter the new value will have a blank price.
If you delete any quantity or parameter value then it will just be removed
If you add a new parameter then all the prices will be copied across to include the new parameter.
If you delete a whole parameter then the software has no idea what the reduced configuration will be so everything will be set to zero.