Need help to create CI's from Data Source Import

[Rajini2]

We are trying to import huge list of CI's and then Assets must be created from that. What is the best way to do this?

I came across this "CMDBTransformUtil Usage in Transform Maps" https://www.servicenow.com/community/cmdb-articles/cmdbtransformutil-usage-in-transform-maps/ta-p/26...

Tried. But, I am getting an error "Error importing CI: createOrUpdateCI failed."  

This is my transform map script: onBefore

(function runTransformScript(source, map, log, target /*undefined onStart*/ ) {

	log.info("Status Log ImpSet");
    // Call CMDB API to do Identification and Reconciliation of current row
    var cmdbUtil = new CMDBTransformUtil();
    cmdbUtil.setDataSource('ImportSet');
    cmdbUtil.identifyAndReconcileEnhanced(source, map, log);
    ignore = true;

    if (cmdbUtil.hasError()) {
        var errorMessage = cmdbUtil.getError();
		log.info('Error: ' + errorMessage);
        log.error('Error importing CI: ' + errorMessage);
    } else {
        log.info('IE Output Payload: ' + cmdbUtil.getOutputPayload());
        log.info('Imported CI: ' + cmdbUtil.getOutputRecordSysId());
    }

})(source, map, log, target);

I am not a CMDB expert, so I would highly appreciate your help in this.

Thanks.