How To Merge And Unmerge In Protected Sheet

I have a protected sheet to avoid delete of functions. In a specific area, however, i have merged cells of five columns in rows. Because in these lines i have write some text and overcomes the rows, after, what i do is: i unmerge the rows and choose 3 rows from 5 columns together and merge. Thus, the text is in one framework. In fact, every time, i want to merge different regions, but always i want to merged any areas who have marked with the mouse. Then, i delete the text and i need to redo the context of three lines, three separate lines. I hope you understand what i need.MergeAndUnMerge.xlsm