Making a subwallet?

[12648430]

I'd like to have the client on my computer be the only one that ever has access to my master private key, and give only a subwallet's private key to my phone - so that I can spend from any accounts on my computer, but only have any access to a certain subset on my phone. I know this is possible with BIP32 key generation, but the UI has no options for it and I haven't been able to find documentation on doing it. Can I do this by exporting my private keys, picking a subwallet's master key and importing that into the client on my phone? Or would that not work / confuse the phone's client?

[btcven]

BIP32 is not enabled in 1.9, you'll need to wait until 2.0 is released https://github.com/spesmilo/electrum/commit/a9159729aaed9cfb07ecc8f8536f51e580448fe7

Exporting any of your private keys right now will put your entire set of private keys in risk, so you better don't do that. If you wait for 2.0, you'll be able to do what you want using the menu option Wallet > New account