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Any funds you send to the same account will be added to your stake.
You can stop staking at any time, send your desired amount of funds to another ADA address and they will be deducted from your stake leaving the rest as they were. If you want to stake with more than one delegator use another account for each one. You need a different ledger device for each account, or change the seed words in ledger if you only have one.
Another good option for managing ADA is the Yoroi wallet accessed with your ledger device. Yoroi is an add on to your web browser. You don’t have to wait so long to sync your wallet. Daedalus uses 16MB of memory just to run.