You can design your document collection form by pre-populating a Dynamic List component with your customer data and using conditional visibility to show customer-specific document options. I found the following relevant resources:
- Dynamic List data binding and pre-population
- Conditional visibility with Hide if expressions
- Using ‘this’ keyword to reference fields within the same list entry
- Dynamic select options based on other fields
- Group component for organizing form sections
Does this help? If not, can anyone from the community jump in? 
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