It's been a while since your last post, so I hope that you've been well and I'm glad to see that you're still using the QuickBooks Community as a resource for your QuickBooks Online questions. As always, I'm here and happy to help you with working in the program.
It sounds like you may be asking about inventory setup or perhaps billable expenses in the program. With more detail and clarification to make sure we're on the same page, I'm confident I can let you know whether what you're looking to do in the program is possible. For now, I've pulled some resources for you about setting up your inventory and using billable expenses, which does include a markup option. Here are those links.
If you're looking for other ways to create custom prices for certain products and services or for specific customers, I recommend QuickBooks Online's Price Rules feature. This article explains how that works and how it may benefit your books: Set price rules in QuickBooks Online
If what I've mentioned isn't quite what you're looking for, please feel free to elaborate in a response on this thread. I want to make sure you have the answer you're looking for so you can continue to manage your inventory in QuickBooks Online.
Take care.
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