For each cell, you can define in advance what type of contents is valid for that cell. This allows you to guide users through data entry in OpenOffice.org Calc by restricting cells to receive specific values and ranges.
For selected cells, a drop-down list of possible values can be defined. In this tutorial, we show how this is done.
Step1: Select the required cell and open the data validation dialog as shown below.
Step2: In the Criteria tab of the validation dialog, the Allow option is itself a drop-down list. We select List.
Step3: With List slected, a text box appears which we populate with the list of allowed values for the selected cell(s). We are almost done.
After closing the validation dialog, we see that we now must select a value for our cell from the drop-down list we have just created – as shown below. It is also acceptable to leave it blank.