"Portion of one's revenue" refers to a specific amount or part of the money a person earns or generates. It indicates a fraction or share of their income or profits that is set aside or allocated for a particular purpose or use. Full definition
Pull apart most balance sheets of any large company and you'll likely discover a significant portion of their revenues comes from somewhere other than their home country. (moneysense.ca)
In order to sustain our operations, including continuous improvement of our curricula, a small portion of the revenue generated from our optional services goes to support our organization. (openupresources.org)
The larger portion of the revenue is retained by the publisher, in acknowledgement of their out of pocket risk and expenses. (thefutureofink.com)