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This is an AcroForm made with Adobe Acobat not with AEM Forms. This is a totally different type of PDF form. AcroForms are static and can't change the layout dynamically. The ony thing you can do is to cover the sections to be hidden with a white, read-only button or field. Then you add a script to the field you select the vendor type to change its display property.
Here's a blog that shows how:
https://acrobatusers.com/tutorials/show_hide_fields/
If you need more help on this please use the official Acrobat forum:
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