I'm glad you're using QuickBooks to manage your sales receipts. Rest assured, I'd be happy to share more information about how sale receipts work in QuickBooks Online.
A sales receipt is used for goods/services rendered at the time of a purchase (sometimes referred to as a "point of sale" purchase), or if your customers give you immediate payment. At this time, there isn't a way to merge multiple Sales Receipts into one. Based on what you've described, I recommend looking into creating a customer statement. A customer statement notifies your customers where they stand and if they still owe you any money. You can send it to your customers on a regular basis.
Give this a try and if you have questions, I recommend contacting our support team using this link. Otherwise, feel free to leave a comment below. I'll be on standby.
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