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Castellans of the Imperium Detachment
Units can be drawn from basically any Army of Imperium codex and their supplements. There's literally big lists of units you can take for each slot, which at a quick glance seems to basically include everything besides unique characters (aside from Black Templar, Adepta Sororitas and Inquisition unique characters though, which can be taken. Pask and Yarrick too). Interestingly enough, Codex: Inquisition and Codex: Adepta Sororitas are listed alongside Codex: Imperial Agents as available sources. That should clear that debate right up. You also must also include units from at least two different factions.
HQ: 2-4, Troops: 4+, Elites: 0-6, Fast Attack: 0-6, Heavy Support: 0-6, LoW: 0-3
All units get Hatred. If you have the max number of units, except troops, everyone gets Zealot
Each time a Troops Choice is destroyed, roll a d6. On a 5+ an identical unit immediately goes into Ongoing Reserve, and counts as a unit from this detachment (so it can potentially be recycled again later)
Warlord can re-roll Warlord Trait

This detachment has clearly laid out the unit slots available to it.

If i take a spacemarine HQ on a bike can I now take spacemarine bikes as troops here? OR Can I not take bikes as troops because in that codex bikes are listed as Fast Attack options?

What says you?

http://www.dakkadakka.com/dakkaforum/posts/list/714038.page

covered in the link above.