Modding Help: Creating a CB

[LordMagnus]

I am trying to create a cb but its the most complicated thing I have come across so far (in ck2 modding)
I want a cb that does the following:
on success -

• Arys gains k_north that is independent of the iron throne (can swear fealty or proclaim himself king in the north)
• gains Winterfell (County and Duchy)
• Imprisons both Boltons
• adds a feud between Graystark and Manderly
• makes Moat Cailin dejure part of Whiteharbor
• marks both Boltons as traitors (can be executed or banished}

on failure -

• Roose imprisons Arys
• Whiteharbor (county and duchy) is returned to Manderly
• Moat Calin is returned to Roose
• Arys losses claim on both the North and the crossing

I have given it a multitude of attempts but so far I can only get results akin to this:

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I mainly tried to modify other cbs to fit what i wanted but its not really working out and Im a bit worried about making one from scratch as the mod seems to use a lot of triggers and flags to make the mega war system work.

I would be grateful for any tips regarding this issue.

Old Issue

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I'm trying to add a war that is already in motion at the start of the scenario which I managed but a day after it simply ends inconclusively (CB no longer valid) so how would i go about fixing this?

Images of the issue:

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[Arcvalons]

You'd be better by forcing an event after the CB rather than attempting to make everything work through it.