The phrase "to balance the amount" means to make sure that two or more things are equal or in proper proportion to each other. It could refer to adjusting quantities or values to create a fair or even distribution. Full definition
This included balancing the amount of daily cash / credit received to reported sales. (jobhero.com)
There exist only records of transactions between different addresses, with balance amounts that keep on increasing and decreasing. (rilcoinblog.com)
These guidelines included balancing the amount of timber, concrete and stainless steel in the structure, and letting the maximum amount of light stream in through the north - facing windows. (australia.com)