ecoxotic,
Click here for some webinars that will help with customization. The customization section is near the bottom of the screen. Also, here is a guide to the screen designer if you're unfamiliar with it. To get you going, I suggest editing the line item grid and looking into the actions on the Item field. You could add actions to the Text Change event to consider customer price levels in the calculations. Take a look at my screeshots below. A consultant would be able to give you a proper estimate. If you would like to speak to one, you can email me directly and I'll put you in touch, or you can contact us here.
Jason
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Jason Masina
Community Support Specialist
Method Integration Inc.
Toll Free: 1.888.925.6238
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Fax: 416.640.6027
E-mail: j.masina@methodintegration.com