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"Tap Line" introduces dummy or extra bus at identified distance from each of the bus. Electrically circuit does not change unless the dummy bus is connected to any other network. So, in absence of network connected to extra dummy bus, no change is required. If reversal is intended with purpose, following steps may be helpful, 1) disconnect all networks connected to Dummy bus (this itself is electrically Ok) 2) save line parameters (lines on both sides of dummy bus to be deleted) 3) execute join bus (delete dummy bus and retain original bus) 4) update line parameters (sum of both side lines) Above steps can be executed through .py or .idv (can save macro)