Expenses/purchase invoice: part charged to client, part own cost

Hello,

I’m a new user here and I have a question.

I understand that if you provide hosting (whether abroad or not) for your customers, you can book this under the ‘trade goods’ category. But what if part of this purchase invoice is for your own use and the other part is to be passed on to multiple customers, for example? How do you book something like this?

In this case, it also involves a foreign company (purchase invoice), so with reverse-charged vAT. The re-invoicing is to Belgian customers.

Thanks in advance for your help.