When creating a custom field is their an easy way to set the value for that field on every record? Or do I need to script something? I'm creating a custom field for Employees and I would like to set the value of the field to 0 for every employee

you can try with script parameters

Why not just run a mass update?

Mass update should solve the problem unless it is a column field

Would default value on the custom field not work?

Yes, mass update done the job thanks. Didn't even know that existed. Setting the default value on the custom field only works for new records I think.

Default value doesn't update existing records, only sets on new