Performing a Part-only analysis prior to modelling the mold cavity will give you a better idea of how best to distribute and orient your part(s) and runner system.
First prepare the part:
().
(), to set an injection location on your model. Cross-hairs will appear. Click on the cavity to locate the injection position(s).
(), and then select an analysis sequence from the list. The analysis preconditions are displayed in the Analysis information pane.
() to perform the analysis.