supp.js

// This key value pair keeps track
var TRACKING = {};
// Looping through orders to invoice
MyInvoiceData.forEach(function(e, i, a){
    // See if PRO is tracked in memory
    if(TRACKING[e.PartnerPrimaryOrderID]){
        // increment number tracked
        suffix = TRACKING[e.PartnerPrimaryOrderID] + 1;
        // set the tracked value to inscrement amount
        TRACKING[e.PartnerPrimaryOrderID] = TRACKING[e.PartnerPrimaryOrderID] + 1
        // pad to create proper suffix
        suffix = leftPad(suffix, '-000');
        // create suplmental invoice
        DoSuplmental(e, suffix);
    }else{
        // run sproc to see if suplmental or standard
        var InvoiceNum = exec(SPROC);
        // If no records returned, it is original
        if(InvoiceNum.length == 0){
            // create standard invoice
            DoStandard(e);
            // add pro to tracked with value 0 being original
            TRACKING[e.PartnerPrimaryOrderID] = 0;
        }else{
            // If more than 0 records returned, it is supplemental
            
            // Set the suffic to number of invoices sent plus one
            suffix = InvoiceNum.length + 1;
            // add pro to tracked with value or suffix
            TRACKING[e.PartnerPrimaryOrderID] = InvoiceNum.length + 1;
            // pad to create proper suffix
            suffix = leftPad(suffix, '-000');
            // create suplmental invoice
            DoSuplmental(e, suffix);
        }
    }
});