Thanks for joining the conversation, @Dima GS.

Setting them as main accounts roles up all the expenses used for a specific vehicle, each of them getting the same priority on your statement.  The method allows you to run a collapsed or expanded report. You can see the summary performance of the business and get at all the details.

Depending on how you want these transactions to show on your report, make sure to select the most convenient and easiest way to track expenses. 

I recommend checking with an accountant to ensure everything is accurate.

Post again in the Community if you need anything else. I'm here to help. Have a good one!