I have figured out how to filter my Gallery by both the Barcode Scanner and the Search Box, but I don't know how to write a formula for the Gallery that will allow me to do both.
Barcode Scan Method:
Scanner --> OnScan = Set(V1,BarcodeScanner1.Value)
Gallery --> Items = Filter(Table2,'Alias Item Number'=V1)
Search Box Method:
Gallery --> Filter(Table2,StartsWith(Alias Item Number,SearchBox.Text))
I'm sure this is an easy fix, but I am not very familiar with the PowerApps syntax