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In reference to the stratagem in the latest space marine codex I believe it’s called tactical flexibility. The rule states that a unit that has combat squads ability can be broken up mid game. It says that all rules that apple to one of the units apply to the other unit after the are spilt up. Does that mean if one squad is on on side of the board next to a captain and rerolls 1s to hit that the other squad on the other side of the board not next to the captain can also reroll 1s to hit ? Or if I use another stratagem on the one squad that it applies to the other squad even though they are separated by a distance ?

Not really familiar with SM or own the codex but doesn’t the split rule also say that they are two units after the split and treated as different units.

I think they simply saying that you use the rules on the datasheet for both and that both have chapter tactics as they normally would have.
Otherwise they break doctrines if I’m not mistaken..?

What the rule is saying is that any affect that is imparted to the pre-combat squadded unit is considered to be on both post-combat squadded units, with all applicable restrictions.

IE: you cast a psyker power on the squad or use a stratagem on the squad, then split them, both mini-squads will retain the effects of said power or stratagem until they end, as defined by the individual power of stratagem.

It doesnt quantumly entangle them and allow for wacky shenanigans like the ones mentioned in you OP.

TACTICAL FLEXIBILITY
Space Marines are able to reform their ranks at a moment’s notice.
Use this Stratagem at the start of your Movement phase. Select any number of ADEPTUS ASTARTES units from your army that have the Combat Squads ability and contain 10 models. Each of those units is divided into two units of 5 models. Any rules effects that applied to a unit selected for this Stratagem apply to both units of 5 models.

So if you used a Stratagem on the full unit, say Veteran Intercessors, both of the units created by the split are affected by that Stratagem.

Ah thank you ... I understand now ... I figured this was the case but the wording that says and “rules” that apply is weird because it’s not often they refer to anything as a rule ... I didn’t know if by rule they meant auras , modifications etc but it looks like pre stratagem characteristics would be what the general consensus is here

Basically, anything rule that impacts the unit at the time of the switch that doesn't require measurements at the time of application affects both units.

Aura are out, because each time you want to use an aura you need to measure to the unit in question.

A power or ability that is directed at the unit and then affects that unit for a period of time (including the remainder of the game) will impact both units when they split for the indicated time period.