Glad to have you back, @lerxxst.

Allow me to help share some insights about allocating a single bill to multiple clients in QuickBooks Online.

You're now on the right track in allocating a single bill to multiple clients, however, rounding off of amounts to the nearest hundredths is set as default within the program. For now, you can save the bill that you're trying to create and make a journal entry afterwards to adjust the excess amount. 

Our developers are constantly working to meet our customer's needs and demands. I'd encourage you to visit our QuickBooks Online Blog regularly to be updated about our latest news, features, and updates about what our Product Care Team is working on.

Don't hesitate to let me know if I can be of additional assistance. Cheering your business to continued prosperity.