Allow Account To Change To Sub-Account

I would like the ability to move an already existing Account underneath another Account. Currently, I can only create new Sub-Accounts within an Account. There is not a way to re-arrange the account structure for Accounts that already exist.

For example, say these 3 accounts currently exist at the same level:

• Account A

• Account B

• Account C

I want the ability to move Account C to be a Sub-Account of Account A, so the structure would look like this instead:

• Account A

  • Account C

• Account B