subtotals for transactions including different items

It would be great if we could itemize the categories of a transaction. Currently it is really inconvenient to add a transaction that includes subtotals that belong to different categories. F.e. when I buy something online for a total of 100€:

50€ Tech Item

20€ Make Up

30€ Writing materials

then I would want to add this as one transaction as this is how it would be deducted from my card. I would however also need to set different categories for the subtotals/items that make up the total transaction amount.