Comparing or calculations on many numeric/decimal fields in Zendesk ticket

Hi,

In our Zendesk tickets, we have a couple of numeric or decimal fields in many. It would be efficient for the agent if the calculations or comparing these fields could be set up.

Examples:

1. I have costs like hotels, meals, and others which are numeric fields. In the end, I have field 'Total' where is a number which is a sum of the three previous fields.
   Hotel + Meal + Other = Total
   
   The above will help us to eliminate human error when calculations are done manually and manually copied.
   
   
2. I have different costs, and some costs cannot be higher than the other. I would like to have a possibility to set up such conditions, which would pop-up an error and prevent from submitting a ticket.
   Example (based on the previous one):
   
   Meal < Total
   
   Meal = 20
   Total = 10
   It will show an error saying that the Total field cannot be lower than Meal
   
   Meal = 10
   Total = 20
   No error, agent can submit a ticket

Thank you