When drawing products (Draw > Draw Products), you can right-click in the product list, expand the “More” list at the bottom of the menu, and select Edit Design Data. Then, select the product you wish to access.
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When modifying products (Modify > Modify Products), select Edit Design Data, and then select the product in the drawing.
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From the Product Viewer, select the product from the list, right-click, and select Edit Design Data.
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While in the Product List (aka Overdrive Pro), select the product and then click on the product tab at the top of the list.
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Lastly, click on the Edit Design Data icon on the tool strip and then select a product.