//Replace Your Field with "custom_salary1" //


frappe.ui.form.on('Employee', {
    refresh: function(frm) {
        // Add a trigger when the form is refreshed or loaded
        frm.events.custom_salary1_from_ctc(frm);
    },
    ctc: function(frm) {
        // Add a trigger when the ctc field is changed
        frm.events.custom_salary1_from_ctc(frm);
    },
    custom_salary1_from_ctc: function(frm) {
        // Get the value from the ctc field and set it in custom_salary1
        var ctc_value = frm.doc.ctc;
        frm.set_value('custom_salary1', ctc_value);
    }
});