Although the Workflow Designer wizard of SharePoint Designer 2007 does not categorize workflow actions, in this book, we have organized them into groups of actions that complete similar tasks.
Core actions allow you to manipulate dates and times, build a form to collect information from users, and write information in the history list. The following table describes the default core actions.
Add Time To Date
Using this action, you can add or subtract minutes, hours, days, months, or years to a date. This date can also be a lookup value referring to a value from another list on the same SharePoint site. The output of this action can be saved into a new or existing workflow variable.
Assign A Form To A Group