One very important key to understand when integrating data sources to feed into the CMDB is CI identifiers. These are rules that define specific criteria used to identify & match equipment during import for create/update operations. If equipment was manually added to either system (Nlyte or SN CMDB), the attributed used by these rules must be present to setup a long term (repeatable, reliable) successful integration strategy. Its certainly very feasible -- but the data sources must have appropriate data defined & CI ID's for correlating between sources.
More info https://docs.servicenow.com/bundle/london-it-operations-management/page/product/discovery/concept/c_HowDiscoveryIdentifiersWork.html
It unclear what "does not integrate with CMDB table" really means?? What specific table? what specifically isn't working?
Side note, May I suggest you tag this question as a "Discovery" issue, which sounds more likely (vs. Service Mapping)
