I use console to save and load savegames at the start of each segment. Menu allows for <10 save games. Suggestion: "savegame 101" for Bricks, "savegame 102" for Sender, etc. This way you can always load a segment to do a split.

use console to save and load savegames: <savegame 999> <loadgame 999>

The Esc menu only allows for about 10 savegames

I use the following convention for the savegames: 110 - Bricks 120 - Sender 130 - Sunder 140 - Votowne 150 - Hive 160 - Hephaestus 170 - Levant 180 - Sender, FTM apparatus 190 - Sender, museum heist 200 - Grimacer and prison 210 - Whitedon 220 - Commiteon base 230 - Ballotine 240 - White caves 250 - Votowne, visit 2 260 - Limbus 270 - Bricks, visit 2 (to be continued)