To change pricing settings for the quotation, first ensure that the desired Price Type and Sales Channel have already been added in the Admin Portal, and that the desired items are mapped to that sales channel as well.
Then, open a new design or copy of the design, and ensure that the active sales channel is not limited to the original sales channel. To do so, go to Preferences in Global Preferences and Settings, set the Select the Preferences dropdown value to 'Active Sales Channel' and set Active Sales Channel to 'Allow all' or '<name of new sales channel>'.
Next, enter the Pricing Quotation, by going to Production Tab and then Pricing Quotation in the Toolbar.
In the quotation that opens, select Settings icon in the toolbar.
In the window that opens, click on the Pricing Settings tab.
Specify the desired price type from the active Price Type dropdown menu, and the desired sales channel from the Pricing Sales Channel dropdown menu.
Select Apply to apply changes.
The items listed in the pricing quotation will display the prices assigned from that sales channel and price type.