I’m selling customizable LED signs but need to know if there’s a way to allow the customer to put their personalized request in, with their purchase.
You can allow them to add the notes as well and they can leave their requests accordingly.
you can make it more interesting and selective for the customers with custom JavaScript and code.
hit me up if you need detailed instructions or help
skype id: sonu.dhamu
Hi @Glory2God 
this is colloquially “product personalization”, or “product options” when searching the app store.
For a simple text inputs, such as could be used for a monogram etc, use line-item-properties theme customizations.
https://community.shopify.com/topic/616503
For visual previews, 2D or 3D, that most often requires an app and very good planning.
If you have the proper budget and need this type of customization, or personalization app integration, then contact me for services
Contact info in forum signature.
ALWAYS please provide context, examples: store url, theme name, post url(s) , or any further detail in ALL correspondence.