Hey Bob,
I didn't know this was a rush item :)
Here is what I've come up with (pick4 makes it more involved for a formula approach)
put the 3 digit number in cell K1 and the following formula in cell B1 and copy and paste as far down in the B column as your data in the A column goes.
=IF(LEFT(TEXT(A2,"0000"),3)=TEXT($K$1,"000"),"TRUE "&TEXT(A2,"0000"),IF(LEFT(TEXT(A2,"0000"),1)&RIGHT(TEXT(A2,"0000"),2)=TEXT($K$1,"000"),"TRUE "&TEXT(A2,"0000"),IF(LEFT(TEXT(A2,"0000"),2)&RIGHT(TEXT(A2,"0000"),1)=TEXT($K$1,"000"),"TRUE "&TEXT(A2,"0000"),IF(RIGHT(TEXT(A2,"0000"),3)=TEXT($K$1,"000"),"TRUE "&TEXT(A2,"0000"),""))))
This will match 3 digit values in cell K1 with the leftmost 3 digits, or the rightmost 3 digits, or the leftmost single digit and the right most 2 digits, or the leftmost 2 digits and the right most single digit of the 4 digit number in any of the A cells that have matches.
In other words if "123" is in cell K1 it will match A cell values of 1234, 5123,1623 and 1273, etc.
Let me know if this is not what you wanted,
Ed S.