In order to fully answer your question I need to ask a few. 1) Do you have the MCU Module? 2) Were you going to try and add it to this Module? 3) Are you going to try and simulate it or do you just need it for non-simulating purposes?
If you could answer these questions then I can provide you with a more intuitive answer to your question.
I was wondering if there was MCU functionality / Module support (for Multisim 10.0) that was avaliable in addition to the symbol/footprint for the 18F452. (Like there is for the 16F84)
Alternatively, if there is support for a 18F series microcontroller with ADC, Timer and PWM peripherals then that could also be useful.
I'm guessing that there is little chance, but any help would be much appreciated.
Multisim currently only supports the PIC16F84, PIC16F84A, 8051 & 8052 for MCU simulation. If you really need to simulate the PIC18F452, you can always try Proteus VSM or VirtualBreadboard.
VirtualBreadboard has a free community edition. The personal edition is also available at very low cost.