Yes, this can be achieved by selecting the ‘Crystallise’ action on the relevant Uncrystallised Account. You will be given the option to ‘Select Drawdown Account’, and from here you can either add funds to an existing Drawdown Account, or you can create a new one. 

If for example you wish to crystallise a Pension and then invest the drawdown funds 50/50 between two model portfolios, you would repeat the crystallisation process twice, once for each Drawdown Account, which can then be invested into the appropriate model.