Create a copy of your study, add two injection locations, run a Fill+Pack analysis, and then compare the results with the study that has one injection location.
Usually, you will modify the model or process settings and then compare the results of a Fill+Pack analysis run on the different versions to optimize your design.
When the analysis completes, you can compare the results to the study that has one injection location.
By comparing the results, you can see that the model that has one injection location may result in a better part. The model that has two injection locations takes longer to fill and longer to cool, and seems to have more air traps.