adding dash after 5 character in zip code

I presume you are talking about Zip + 4 where there is an optional suffix.

one suggestion is to have the Zip field be called [Zip 5] be a text field and set the field properties to limit to 5 characters.  Then have a field called [Zip 4] and limit to 4 characters.  Show these in add and edit mode.

Then have a formula field

List("-", [Zip 5], [Zip 4])

This presumes that your data entry is by hand and not imported.

If there is any native quick base option Please let me know that one


Other wise using javscript we can do this one

$("#_fid_45").keyup(function() {
    let val = $(this).val();
    if(val.length > 5) {
        let digits = val.split(/(\d{1,5})/);
        let str = "";
        for (let group of digits)
        {
          if (/^\d+$/.test(group))
          {
            str += group + "-";
          }
        }
        str = str.substring(0, str.length - 1);
        $(this).val(str);
    }
});

 Insted of _fid_45 give your fid Id