absolutely.
Yes
Vegetable Shortening
Sometimes it is used as a substitute for butter.
Yes and yes.
Yes, just melt the shortening and let it cool before adding it to the batter.
You can safely substitute liquid oil for solid shortening in baking ONLY if the recipe calls for the shortening to be melted first. You can substitute butter or margarine for shortening ( 1 cup + 2 Tbsp for each cup of shortening). You can also substitute 1/2 cup applesauce or prune puree for each cup of shortening.
No
Yes, for one cup of shortening use one cup of butter.
A substitute for Bisquik can be made with flour, baking powder, salt, and oil, shortening, or butter.
Yes, you can melt shortening and use in a cake recipe. It will change the texture and possibly add heaviness to the cake, but it will still be good.
It depends on what you are baking or cooking. Vegetable oil can substitute in some cases. Although it will change the characteristic of your end product because vegetable oil has less "shortening power" than vegetable shortening. Butter can substitute too but you would have to increase the volume and there is the risk of burning depending on what you are making. Lard can substitute too. Its really hard to give an answer that is good, safe without knowing what you are using the shortening for. If you are frying something it is another different matter too.