Presumptive tax u/s 44ada

In recent budget, presumption taxation on professional income is introduced @ 50% of professional fees. I am working in a group of companies in Vadodara. I get professional fees from two companies and salary from other two companies. My COI consists of salary income, professional income, interest income etc. My question is whether I can offer 50% of my professional fee income for taxation separately apart from taxable salary and interest income??