Hi Mike, welcome to the forum.
Hopefully this code works for you. It not only un-hides the rows as you add data into column B, but it re-hides unused rows if you start deleting values and there is nothing left in column B below that point. If you clear multiple cells at once, leaving a number of blanks, you just have to pick one of the remaining blanks in column B and press Delete for them to become hidden.
To add this code to your workbook: Right-click on the sheet tab for which you want this code to be triggered and choose View Code. Copy the code below and paste it into the VB Editor window. Close the VB Editor window. From that point forward, any change you make to cells in the range B5:B1048576 will trigger the macro.
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