Matching a receipt with a sales Order while entering receipt in AR (Instead of from Sales Order form

I know that if I enter a sales order, I can also enter a receipt from Sales Order form (Actions/Payments). That receipt is tagged to the Sales Order; that's why when sales invoice is created, the relevant receipt is automatically applied to the sales invoice. But that functionality works well when Sales Order amount equals to the receipt amount i.e there is one to one relationship b/w sales order and Receipt; or there there are multiple receipts against one sales order.

I want a solution how to tag a sales order with a receipt in following scenarios: