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1. Prepare a calculation logic with at least one element (whose Display Mode == Price Grid, otherwise you will not be able to pick up any Output fields in the Configuration of LPG).
2. Make a new LPG.
3. In a list of LPGs, select your LPG and using the action icons below the table do the following:
   1. Add products into the selected LPG.
       You must add some products, otherwise you will not be able to configure the LPG in the next step.
   2. Configure the LPG (i.e., add a logic into it, select Output Elements). 
   3. Calculate it. 

For details on the settings see Create and Configure New LPG.