Multisim - How to create a 2-pin red/green LED in one part
The 3 pin red/green is called common cathode.
A 2 pin with red OR green is a bidirectional LED e.g. Kingbright WP937EGW 
Then there is an LED with both red and green in the same package e.g.   Marktech Optoelectronics MT2030-HRG-A 


A red green in the same package has the same model as any other LED. 

If looking for a bidirectional then search for "bidirectional LED".