I don't know the specifics myself, but here is what another user posted:
"I'm guessing you already have moved your saves over to your new account with the save resigner floating around. Well what about the trophies you ask, here is how to put them on new account.
Hey just wanted to share something I tried last night after reading a crap ton on ps3 dev wiki. I was pissed that I. Couldn't have my trophies on new account it sucked and made me think.
What if :
Dev_hdd0/home//trophy
Take that trophy folder and transfer it to
Deb_hdd0/home//
Then rebuilt ps3 database in recovery (takes about 15min)
Loaded up ps3 and went to my new account and BAM!!! all my trophies are on my new account ^_^
Can't sync yet though 80022D11 error when synching I'm trying to figure away around it. Might have to find way to resign the tropdat to this user account so psn thinks its legit ^_^
Step in right direction for transferring all account stuff though ^_^"
Credit: snkysnake02
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