I got inspired by this reddit post: the post shows the player having a portal gun upgrade where the player would normally have just the normal portal gun. With this you can have 2 sets of portals that are fully functional, the only downside is some insignificant graphical glitches. In later test chambers you can see how the orange portal gets replaced by a blue one for some reason. use command give weapon_portalgun and upgrade_portalgun to get the effect!
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