Not necessarily, but starting with a feed is a great way to bring in
your entire catalog at once. This is the way that I started my catalog
and I also set-up rules in Launch to feed the catalog on an ongoing
basis. However, to do this you must write all your data (name value
pairs for the catalog parameters) to the data layer so Launch can pass
it. Everything I needed was already available due to it's SEO value. If
you only set-up the rules to pass data to the mbox and into the catalog
you have ...