In accounting “transfers” are contra entries between “cash and bank accounts” . the moments you transfer from a cash/bank account into another account not included in the cash/bank control accounts it no longer a transfer, it either a payment or an advance for payment. So the appropriate method for transfers is to use “Spend Money” to move funds from Cash/Bank into other account.
@Abeiku is correct. Bit if you want to record the reason you transferred money from one account to another for some reason, use the Description field on the transfer screen.