Order Make Addition

Good Day

How or where could i add Order - Make - New Pick Note (Custom App / Doctype) and copy Order details to Custom App in Parent table items?

Thank You

Albertus Geyser

In selling/doctype/sales_order/sales_order.js & [your_custom_doctype].js at [your_custom_app]/[your_custom_app]/doctype/[your_custom_doctype]/

Good Day

Thank You. . .

Got it working So Far:

But get this when pressing Custom Button:

Thank You for help again.