Formula linked start and end dates

Hi I am just beginning to use Omniplan, can someone please let me know how do I set formula driven start and end dates. To make it more clear I am looking for some spreadsheet like functionality where in I can define the start date (along with dependencies) and then use a formula based on the productivity of the resources to calculate the workdays required and further use it to get the end date.
Thanks

@Siddharth Hmm, I’m not sure if OmniPlan if I understand exactly what you’re looking for. OmniPlan can automatically calculate how long a task will take based on the efficiency of the resource and output an end date for the task based on that calculation. This isn’t based on a formula manually entered into OmniPlan however - this scheduling is automatically done by the app.

Thanks, will have a look at this.