When you're testing procedures, you can temporarily convert a block of VBA code to comments that will be ignored during a trial run.
Doing so manually by inserting an apostrophe before each line of code can be a real chore.
To simplify this task,
Open any module in the Visual Basic Editor (VBE)
Choose View >Toolbars>Edit from the menu bar to display the Edit toolbar.
Select the lines of code that you want to turn into comments.
Click the Comment Block button on the Edit toolbar (it's the sixth button in from the right end of the toolbar).
Each line of the selected code is now preceded with an apostrophe. To convert the comments back to executable code, select the appropriate lines and click the Uncomment Block button, which is immediately to the right of the Comment Block button.