select by filter only by one property (OPENROADS)

Hello,

I have a model with two types of tres imported by a .shp file. The only property that makes them different is in PROPERTIES---AFECTAT--- 1 or 0 (depends on the two types).

I need to select them by separate, and get one model only with the AFECTAT --- 1 and the other one with the AFECTAT --- 0. How could I do it??

Thanks!