I’d love to know a little more about the workflow you’re looking to achieve here!
Are you looking to track an employees salary each month to then report on this later?
If so, you might like to check out The Numbers Column for this.
You can then create a new column for each month and add in the salary for each month.
If you’re looking to have this salary automatically populate on your board, it would be great to know the logic you’d like to have behind this, so that we can make some more customised suggestions here!