I am using turbotax intuit. How or where do I enter data from my T4A, T4A(P), T4A(OAS), T4ARIF and the details of my charitable donation slips?

When using TurboTax Basic, please click on Find in the top right-hand corner, type in your respective slip number, select it, and click Go.  You will then be able to enter your slips.  You can repeat the step as many times as necessary.  You can also do the same for donations, simply type in charitable donations.