Pooled siRNA reagents can be found in the products tab among the other RNAi products
Some RNAi reagent vendors (e.g. Dharmacon) offer a single reagent containing a pool of varied siRNA products targeting the same gene product. This is a strategy to increase the likelihood of successful expression manipulation compared to single siRNA products. You can find pooled reagents like you would other RNAi reagents on BenchSci: search for your target of interest, indicate the Reagent Type, and then browse the figures and available products. You can compare the pooled reagents against their non-pooled counterparts to find the one right for your experiments.
You can find out more about the targeted gene products by looking at the Accession IDs under product info for pooled products.