A method and a system for a cable infill system that may be used with a railing assembly for an elevated structure are provided. The cable infill system may include a first end-post fitting and a second end-post fitting, each configured to receive a tensioning fitting or a non-tensioning fitting therein for receiving a cable of the railing assembly. The first end-post fitting and the second end-post fitting may each be mounted to an outer surface of a first end-post and a second end-post of the railing assembly respectively. The cable infill system may further include one or more intermediate-post fittings and one or more corner-post fittings, each configured to be mounted on an outer surface of a intermediate-post or a corner-post of the railing assembly respectively. The cable infill system may further include a modular template to aid the installation of various fittings on the posts.