You might also find your answer in the LastPass Enterprise Manual.

I no longer would like to have my LastPass and Xmarks bundled together. How can I only upgrade with one of them?

If you have an active automatic renewal subscription set up, please cancel this renewal on your end so that the bundle does not autorenew. For Paypal, you can find directions on canceling a subscription here. For direct credit card payments via LastPass, you can visit your accounts page to cancel the automatic renewal: "Automatic renewal : Enabled using _________"

Once the subscription is cancelled, on your expiration date, you only need to upgrade the 1 Premium you wish to obtain itself: 

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