I am trying to use Micro-USB port on jetson nano using port splitter into USB and connect the jetson nano to power bank with one cable and I use another cable to connect the jetson nano to my laptop.
But when I do so the jetson nano get powered but I cannot connect to it via my laptop.
That connector is in device mode only (which is more or less mandatory for the connector to be used to power the Nano). No host mode. Unless you have some custom hardware I doubt you can use that port for host mode.