Staffing > Position and Assignment
Find Employee using employee ID, and right click button under current positions > New Record:
Fill position details.
Start with the Start Date.
Secondly, go to Position ID. You will be able to look for records under the Position ID clicking the [...] button.
When choosing a position ID, most fields will be filled automatically, however, all bold fields that are not automatically filled need to have a selection or value. It is important to remember that these fields must be filled according to the necessity for the position.
When everything is filled, Save the record: