Assuming you have HBL0052-77 in A1, put this formula in A2:

=LEFT(A1,3)&TEXT(MID(A1,4,4)+1,"0000")&RIGHT(A1,3)

then copy down as required.

Hope this helps.

Pete

On Mar 5, 1:20*am, rach94 wrote:
Hi,

I am filling cells with the formula HBL0052-77 and am wanting to fill the
series down, but only change the number immediately after HBL, not the last
number ie/ so the next numbers in the series would be HBL0053-77, HBL0054-77.

Is there a way to do this?

Thanks for your help!