Grid spread allocates data across the cells on the webform and runs on the client browser.Mass allocate triggers a calc script which can allocate data beyond cells those are available in the form.

If your administrator has enabled Grid Spread as a data form property, you can specify an amount or percentage by which Planning increases or decreases values across multiple dimensions on the data form, based on the existing values in the target cells. You immediately see the result in the data form and can save the new data or discard it. When calculating the spread data, Planning ignores read-only and locked cells and cells having supporting detail. Data integrity is ensured by spreading values only to cells to which you have access.

If you have the Mass Allocate role (assigned in Oracle's Hyperion® Shared Services) and an administrator has enabled Mass Allocate as the data form property, you can spread data using the powerful feature, Mass Allocate, which:

Allocates data to all the source cell's descendants

Allocates across multiple dimensions

Spreads data even to cells not displayed on the data form

Does not require that you have access to the target cells

Cannot be undone after you mass allocate values

Is processed with dynamically-created calc scripts

Executes the calc scripts against the Essbase server, against all dimension combinations

Can use customized spreading patterns, created by an administrator (see the Oracle Hyperion Planning Administrator’s Online Help)