For example, you had a $1,000 investment finalized and you later invested an additional $600. You can now:
increase your total investment to $1,800 ($1,000 finalized + $600 new + $200 increase),
decrease your total investment to $1,200 ($1,200 locked + $200 new),
cancel your $600 investment (prior to the cancellation deadline) and be left with the original $1,000 investment
but you could not reduce your total investment below $1,000.