Bandhi Navkarwali usually means a Navkarwali mala that is prepared/strung for chanting the Navkar Mantra. In Jain usage, Navkarwali is a rosary used for japa of the Navkar Mantra, and some Jain texts also describe it as a “nine hands rosary”. ( jainknowledge.com)

If by “bandhi” you mean a special local practice or a specific type of Navkarwali, it is essentially still connected to Navkar Mantra smaran and japa. ( jainknowledge.com)