When a formula (formula: A sequence of values, cell references, names, functions, or operators in a cell that together produce a new value. A formula always begins with an equal sign (=).) refers back to its own cell, either directly or indirectly, it is called a circular reference. Microsoft Office Excel cannot automatically calculate all open workbooks when one of them contains a circular reference. However it could be corrected obviously but a lot depends upon the formulae you used to form your planner.
I am a qualified finance professional and a visiting faculty of finance. In most of the cases we use excel to accomplish the work of our clients. I hope I can meet your expectation, but, as I said, a lot depends on the preparation of the excel utility by you. Whatever it is it could be done of course.
I hope to hear from you soon. With Best Regards, cmatapas.