peanutyost you can achieve that by adding it as Product instead, where you can add price to it and same product/service can be applied to multiple clients.
When you invoice, the product will auto-complete after typing first 2 letters of the word, and will auto fill in the item as product, description and the price.
I see the expenses more like for the MSP as internal ones, for accounting aspects, and that should be exclusively part of the MSP company.
In the end, you sell a product/service to client, and all the expenses behind should matter to you only.
But sure, if others see it on the same way as you see it, then why not, maybe replicate the Product to the Expenses