Grant Permission on list
This activity grants permission on the list. You can override or append user or group grant permissions. Value of permission field by default can be one of the following values:
Full Control Design Contribute Read
If any custom permission levels are defined, you can also specify those. For help on creating custom permission levels see http://technet2.microsoft.com/Office/en-us/library/c5dd8b7e-202d-4d33-8535- 5c03f88ea1ff1033.mspx?mfr=true

The activity supports multi permission assignment. Use ‘,’ or ‘;’ separator to grant several permission.
Example: “Approve, Read, View Only”.
SharePoint Workflow Designer Phrase#
Grant this level permission on list url to this members. Override current permissions: No
Parameters
| Parameter | Description |
| this permission level | Permission level string. Multi permission assignments are supported. Use ‘,’ or ‘;’separator to grant several permission. Example: "Approve, Read, View Only". |
| list url | The URL of the list. |
| this members | User or SharePoint Group name. Ex: “user@domain”, “domain\user”, “Viewers”.It allows multiple values separated by a semicolon. |
| Override currentpermissions | No – a new permission will be added to existed permissionsYes – a new permission will override (remove) all old permissions |