After selecting a group of keywords, choose this menu item to change the Tag column of those keywords. You can choose any string as the new tag, and then be able to filter keywords based on that new tag.
There are three pre-defined tags for keywords.
1) Normal - these are regular keywords that have been created by 3DMarketVision.
2) Delete - these keywords have been deleted. They can only been seen by using the Keywords | Filter Keywords ... menu item.
3) Import - these keywords were used to create the current market either through the New Market from Selected Keywords command or through the Import Keywords... command.
Tags also determine the color of keywords in the 3DView Area. The Tools | Color Options... menu item shows a table that associates a tag value with a color which you can edit. Whenever the tag of a keyword matches a tag in the table, then the corresponding color is used when displaying the keyword.
For example, if the tag of a keyword is set to "silo 1" (without the quotes) then that keyword becomes a lime color because in the Color Options table the color of the tag "silo 1" has been set to the lime. You can add new tags to the Color Options table just by clicking the Add Row button. You can delete tags by selecting the row and clicking the Remove Row button. You can edit either the tag values or the colors just by clicking in the table.