2 Simple ways are by dividends and by contract. Either you give them shares and divide profits by issuing a dividend, or you have a legal contract that stipulates such.

However, as a business owner - I would suggest that you think twice before profit sharing.

You should pay fee's for contracts, salaries for employment, or commissions for sales.

Sharing profits should be reserved for shareholders.

However, in my opinion, private companies should reinvest profits to grow the company and not suck out profits.

Doing so will make it more difficult to find investment or grow/sell the company.