To work through some debugging situations, you need to be able walk a program line by line while it's executing. VBA provides four Step commands to accomplish this: Step Into, Step Over, Step Out, and Run to Cursor. You can use these commands after a program halts execution by choosing the appropriate command from the Debug menu.
All four step commands skip over the same type lines of code that don't allow breakpoints: comments, declaring variables (the Dim statement), blank lines, and line labels or line numbers.
The Step Into command steps through code lines one by one. When a code line has a call to another procedure, the editor then follows the code into it. This includes ...