Thanks for reaching out to the Community for support, @sk@cimaint.co.

At this time, there isn't an option available to apply a single payment to multiple invoices with different customers. You would need to create separate payments for each invoice. 

However, as a workaround if you're using an Essentials, Plus, or Advanced QBO plan, you can separately enter the bills (invoices) you received. Then, use the Pay bills feature to pay them all at once. This action will only generate one check since the bills belong to one vendor.

For more information, you may also check out this article: Enter bills and record bill payments in QuickBooks Online.

Let me know if you have any other questions on getting your invoices paid. Just drop a comment below!