If you have shifters with more than one port...
You connect shifters to each other in the handlebars
Then you connect one of the shifters to the 3-port junction
Then you connect the new TT shifter to the newly spare port in the 3-port junction
I do indeed have 2 ports on the shifters, I wasn't aware. Now I get it. Thnx!
@MisterTomTom started
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If you have shifters with more than one port...
You connect shifters to each other in the handlebars
Then you connect one of the shifters to the 3-port junction
Then you connect the new TT shifter to the newly spare port in the 3-port junction