Create a local client price list

Go to [Finance] and [Price Lists]

[Add Price List] 

Give it a name and [Save]

Add your prices for various job types either in [Fixed Prices] or [Room Specific Pricing]

Room Specific Pricing

Choose a product and then add the values.  Do the same for Fixed Prices.

Make sure that the price list is linked to a client on the client screen

Go to the client and under [Finance options] choose the price list from the drop down options

By doing this, when you create an invoice on a job, it will pick up the value from the price list