Custom Checkout Process

[James-Beach]

Hello! 

I'm new to Shopify and had a question concerning checkout options. With Script Editor, is it possible to customize checkout options based on Cart value?

Specifically, let's say I have a cart value threshold of $500:

For orders under $500, I want to only charge $10 shipping.

For orders over $500, I want to charge $20 shipping, as well as a 3% markup fee. 

Can something custom like this be done with Script Editor, or is there another App on the App store that can provide this functionality?

Thank you!

JBRC

[IttantaTech]

yes, is possible to on Shopify Plus plan.