I am unable to see the optimizer option in New Action.
Please help me for the same.
Take a look at this page on Anapedia: https://help.anaplan.com/anapedia/Content/Modeling/Optimizer/enabling-and-using-optimizer.htm
You need to have the Enterprise version of Anaplan, and you need to have the appropriate settings in Tenant Admin.
Hope you are able to enable the Optimizer menu with the help of Tenant Admin.
Also please review the Limitations section while considering to implement the Optimizer: