# generating a defined number of IDs

Dear Smartsheet community,

I am trying to write a formula to generate a defined number of IDs.

In the screenshot below, if I enter 6 into the blue squared cell, I would like that 6 IDs are generated with a number incrementing at the end (ID_1, ..., ID_6).

if I enter 3, 3 labels are generated. (ID_1, ID_2, ID_3).

How could I proceed to generate these IDs based on a desired number ?

• What's the max number of these that you might want to create?

There are a number of ways to do this.

Create columns:

Running: Create a list of numbers, 1-whatever your max is. I do this by putting 1 in row 1, 2 in row 2, and then grabbing both cells and dragging down to auto increment. You can also put 1 in the first row, and then `=Running1 + 1` in row 2, and dragging row 2 down

Placeholder: Put `=Num\$1` in row 1 and drag it down

Num: This is where you put your 6

ID: Create a column formula: =IF(Running@row <= Placeholder@row, "ID_" + IF(Running@row <= Placeholder@row, Running@row))

You could also use a Sheet Summary field, and eliminate the Placeholder and Num fields:

`=IF(Running@row <= Num#, "ID_" + IF(Running@row <= Num#, Running@row))`

• The number will depend on the experiment but currently the max number will be 6 but could be less. We would like to get something dynamic, that can adapt to each experiment.

## Help Article Resources

Want to practice working with formulas directly in Smartsheet?

Check out the Formula Handbook template!