QIf 〈Shirakami Fubuki〉 with hBP02-089〈Oruyanke〉 attached has 10 HP remaining, can I use the Bloom Effect "Gonna Move You a Little" ability of hBP02-012〈Shirakami Fubuki〉 to reattach hBP02-089〈Oruyanke〉 to another 〈Shirakami Fubuki〉?

AYes, you can. After reattaching the mascot, if the holomem has taken damage greater than its HP, that holomem will be downed.

QWhen hBP02-013〈Shirakami Fubuki〉 with hBP02-089〈Oruyanke〉 and hBP02-091〈Fubu-chun〉 attached collabs, between the abilities of hBP02-089〈Oruyanke〉 and hBP02-091〈Fubu-chun〉, which ability do I resolve first?

AAs both trigger "when collab", you may resolve them in any order.

QWhen hBP02-012〈Shirakami Fubuki〉 with hBP02-089〈Oruyanke〉 attached collabs, between putting a card to holo Power and the additional ability of hBP02-089〈Oruyanke〉, can I choose the order to resolve these?

ANo, as putting a card to holo Power is a condition to move the holomem to the collab position for "collab", you will put a card to holo Power before resolving the ability of hBP02-089〈Oruyanke〉.