multi-select field have select all option

You can set up the "Default value" option in the field settings w/ the desired values separated by semicolons, like so:

Hi SkyTriv,

Dan is correct it is possible to set up a default selection of options that will pre-populate for a multi-select text field. One thing to keep in mind is that multi-select text fields are limited to a total of 20 selections at any one time. So if you are making use of a multi-select text field with more then 20 options you would need to pick  a set of 20 to populate by default instead. Alternatively, it is also possible to create a API Edit Record button that will allow you to push a set of values into the Multi-select Text field or a Form rule that can the Multi-select text field to a preset list of options. For example when the Energy Industry checkbox is checked change Multi-select text field to "Industry-Energy; Industry-Power; Industry-Utility". I hope these suggestions are helpful SkyTriv.