You can download that script from this thread.
Just put that python script in your script folder so it can access it when it is called in the macro.
The script is not entirely necessary, but act as a safeguard to make sure everything is facing the correct direction. You could delete that step and it may work fine. It really just depend how the part was drawn.
Python Script file location location:
https://developer.rhino3d.com/guides/scripting/advanced-pthfiles/
Just insert the macro step in the a new button
Important: You have to make your parts into surfaces for this to work. I convert them back to curves using the Silhouette command after I am done making my bridges. The maco will place a .25 .25 plane at the 0 axis to define the tab. The macro deletes it after you place the tab. You can change that dimension if you want your tab wider or narrower than .25
First images is a macro that allows you to place the tabs only. You can merge all faces manually.
Second image I call “live bridge”. allows you to place a tab and the macro runs to automatically merges the faces with each tab to make it into one part with each tab placed.
Hope I explained this well enough. We were struggling with what we wanted to accomplish, but this what I came up with to do what I wanted it to do. I know it seems a little complex, but it works.
Im sure if I was better at python this could be done a lot cleaner. But necessity is the mother of invention. 
Were using a windows 98 program that was made for plasma/laser file generation. It did tabs bridging letters and parts to the sheet. We do a lot signage so every letter has to be bridged to the main part. That a helluva lot of work to do manually. When the program stopped working we move the work to rhino. So i had to get creative. Hope you get it working for you. This macro has saved us a ton of work.