I have both so may be of some help here. There should be a lib folder in SwitcherCad that contains the spice models for your components (hopefully). I looked at mine and some are standard spice models while some are binary files. The standard spice models can be cut and pasted into Multisim and usually will work. The binary files on the other hand are not compatible as I am aware of. Look in C:\Program Files\LTC\SwCADIII\lib\sub and check to see if the parts you want to transfer are there in standard spice format Open these files with Notepad andf check to see if one of the lines contain the statement ".SUBCKT" These are the only one that are compatible with Multisim. You will still have to create a new component for Multisim and then import the model to the component. There are tutorials on the NI Website that are invaluable in learning how to acomplish this. (I still have to refer to them and I have a lot of experince in the Multisim environment. I can't remember everything all the time)
If the parts you need are LT parts and they do not have a standard spice model in the directory, then it may be possible to get these from LT's website. This you will just have to check to see.
I hope this helps some as this is the only thing I can tell you on this.
