Shareoption is available with each API Design Project, Saved request folders, Test Case projects. On clicking Share a popup will appear to select the team you want to share with. If you don't have a team then go to Dashboard and create one. Select the Team you want to share with and you are done. Your shared object will now appear in the APIC instance of each members of the shared team.
Share, Select the team and you are done. Now this folder along with all its sub-folders and saved requests under it will appear in the APIC instance of all members of the shared team. Once sharing is complete you will get the option to Un-Share.