20 C.F.R. § 234.61

(a) Any person who is eligible to receive a share of a lump-sum payment may assign his or her share to another eligible applicant, provided the share is not more than $500.

(b) If an LSDP or accrued annuity is payable, the request that a share be assigned must be received at a Board office no later than two years after the death of the employee or the originally entitled person.