Excel 2007 : How do I get a formula to follow the DATA in a cell rather than the cell itself?

A formula consists of summing specific cells (H34+I19+J22); later, I need to move the data in I19 to J27. How do I write the formula to pick up/follow the data in the cell rather than reference the cell itself? Right now I have to remember to change the formula, which, if I forget, creates quite an accuracy issue. This example is a teeny-weeny version of the process I manage which consists of multiple formulas referencing data that gets moved around. Thanks for any help!