How to tie the sub-line to the figure-eight ring? When removing the main line from the fishing rod, do the sub-lines need to be removed?

I change sub-threads every time I catch fish. It should be 0.4 sub-threads for crucian carp fishing, usually 2 pairs a day. Don’t use any quick pins. There is no figure-eight ring to attach them directly. After fishing, cut the roe line and reuse the hook, then throw it away. Remember that the fewer breaks there are in the entire cable set, the fewer parts there are and the smaller the accessories are, the more sensitive they will be.