Cost Price + Custom field (%) = Sale Price

Cost Price + Custom field (%) = Sale Price

Hi,
I would like to create a custom field. It would automatically put the sale value.

Ex:
Cost Price + Custom field (%) = Sale Price
100 + 10% = 110 

Is it possible with Zoho Invetory?


Other questions:

I have Zoho One, I have 1 parent store, 2 branches and 1 website (Ecomerce - With an API joining Zoho Invetory and Magento2). What is the best program to manage this product and sales, Zoho CRM or Zoho Invetory?

The Zoho Invetory may be the most appropriate, but I see that his settings are more closed than the Zoho CRM, Few options for personalizing the fields. How do I edit all fields in Zoho Inventory?