Staking more Cro in DeFi on the same validator?

Hello there, i'm apologizing in advance for the following dumb question and my grammatical mistakes, english is not my mothers tongue. I just wanted to ask, if there's a possibility to additionally stake more cro on a existing validator? So for example: If i'm currently staking 1000 CRO in DeFi on validator A, is there an option on which i can stake additionally 500 CRO to this already existing stake? So i have everything on 1 validator. :) Thanks for your help in advance and have a great day