Normally, at the time of joining, you might have fixed a salary and established some business targets. Now, if the individual is generating more business, a portion of the profit can be allocated as commission. This is commonly referred to as variable pay.
You should meet with your marketing manager or Head of Department (HOD) to develop a plan that benefits both the organization and the individual, serving as a motivating factor for the employee and ultimately leading to an increase in the bottom line. There are no rigid rules; therefore, it is important to tailor a plan that works for all parties involved.
Thank you - Kameswarao