Thanks for joining the thread, chris272.
I recognize the importance of saving multiple invoices to a single pdf file. Currently, this option isn't possible both in QuickBooks Desktop (QBDT) and QuickBooks Online (QBO). You can open each of the invoices and save it as a pdf file one at a time if you're using QBDT. While for the online version, you can download it individually.
As a workaround, you can consider looking for a 3rd party application that can combine multiple pdf files into one. Refer to this link to find one that suits your needs: QuickBooks apps.
I'm also adding the following articles below if you want to create a custom template for your sales forms:
You're always welcome to post again if you have further questions about saving invoices. I'll be here to help you.
