I have a question about the the possibility.
I use this example: https://fancyproductdesigner.com/product/poster/?start_customizing
When you select "Din Sizes" than the background need to change and if possible that it take an another size inside that picture?
If not, is it possible to use this designer and build my self this part.
Yes, you can do that using for example our Multistep Product Configurator in addition to our Fancy Product Designer. You can get the plugins here: https://codecanyon.net/item/fancy-product-designer-woocommercewordpress/6318393?ref=radykal