I work in a retail store and we use excel for our customer database.
I have very basic knowledge of excel and what I need to do is far beyond my understanding.

Here's the overview. Our customer list is exported out of computer system to excel and each customer has a number attached. These are assigned in numerical order as they join our mailing list. However, we delete customers as they ask to be taken off the list, etc. I need to figure out how to go through and have excel insert a blank row where the customer has been deleted.
For example it might go
1001
1002
1007
1009
1010
I want excel to put blank rows in for 1003,1004,1005, 1006, and 1008
Is there a function that will do this?