Hi DAllen100,
Welcome to the Method forums! Apologies for the delay in responding to your post.
To answer your first query, yes you are correct in your thinking. Provided your customization is correct, Method will apply the custom price level to those 8 or 10 dealers and standard pricing will apply to all others that do not have custom price levels in Quickbooks.
To post a customized screen, I recommend the following steps;
Customize -> Screens -> Copy the stock screen.
-Step 1 : Select 'Copy from this account'.
-Step 2 : Define the new screen name.
-Step 3 : Do not add a Tab Link
Customize your new screen and save.
To post your new screen, create a copy of the customized screen and in Step 3 of the Copy Screen Wizard select Replace Links to an Existing Screen. Ensure you select the original stock screen when replacing links.
Hope this helps!
Noel