So, I've made some progress in setting up 3 multisite stores. Still have a few glitches. The problem I'm having now is this.
If a customer saves products in his cart and signs in, It saves the cart till next time they sign in and combines the current cart with the previous cart. This is a problem if they have been to the different sites. It will have products from each site in the cart. This doesn't work for me as the different shops have different shipping calculations coming from different warehouses. So, here's the question how to keep each cart separated according to it's specific site. In other words, I do not want a cross-cart scenario.
Here are the three sites if interested in checking out my installation.
Knives Etc. at Royal Trading Company
Picnics Etc. at Royal Trading Company
Big Toys at Royal Trading Company