Hello Yashika,
I’m not a 100% clear what you want to do, but I think you have a vector and you want to extract one of the components from the vector. Slicing and dicing vectors. I asked a similar question a while ago: scalars from a vector in the calculator filter . In short you can use the calculator to get a single element from a vector. Use the scalars combo box in the calculator filter right below the functions pad and the components for each vector are listed. Pick the one you want, and click apply.