NTC temperature sensor simulation

My name is Diego,  and have troubles with multisim
I have to make a simulation of an NTC sensor where R is related to T as follows:
In the simulation I have to obtain the curves as shown in the image:
using a circuit like this:
My teacher told me that I have to create an "special resistor" SPICE  model where B and T have to be inputs that dinamically  changes the value of resistance R and then make a DC swep simulation and get the Resistance of NTC vs Temperature graph
After that I have to use this circuit to linearize the sensor and obtain a curve where VR2 is a function of T (using B = 4000 and temperature changes from 270K to 323K)
My problem is that I just know the very basics of Multisim (Place the components then hit Play button and watch osciloscopes or multimeters). I dont even know what SPICE means and how it works, and I dont know how to obtain those graphs.
I hope that some of you guys could give a hand to learn more about using Multisim, I will really preciate your help
Thanks in advance
P.D. : I found a model of an NTC in this topic of the forum (the atached file in there):
http://forums.ni.com/t5/Circuit-Design-Suite-Multisim/How-do-I-make-generic-spice-models-work-in-mul...
But I don´t know how to change the parameters to fit to my job (for meB have to be 3 diferent values = 3 diferent curves and there B is a fixed value =3548 ),  also I noticed that If I hit the play button and measure the current across the NTC sensor I get 220uA so the resistance of that sensor @ 12°C is 12V/220uA=54.5KOhm but acording to the matematical relation for that specified example should be 17.2Kohm (aprox)
I´m using Multisim 12

Hi,
Generally, Multisim allows users to build and simulate circuits even if they have no understanding of spice. I found an online article which tells more details about creating spice models for NTC's.
http://www.ecircuitcenter.com/circuits/therm_model1/therm_model1.htm
Hope this helps.
Regards,
Tayyab R,
National Instruments.

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