Click onto My Tints and Coats Prices to update cost and retail prices for Treatments. This is shown below:

Choose your Supplier catalogue from the drop-down. You can also choose the Type (A = Anti-reflective, H = Hardcoat etc.). Alternatively, enter the Code and Description for the treatment you require. 

Click into the Cost Price to update (if necessary), otherwise choose a Formula to calculate the price (if you use them), or just manually enter a Retail Price. 

To formula-price a batch of treatments, use the Formula Group in the Pricing module at the bottom of the window. This formula can then be Assigned to Selected Items.

See also How Do I Use Formulae?