Your MONITOR system allows you to create Alternate preparations. An alternate preparation means that you can configure certain terms and conditions for the operation or material rows during preparation. Terms and conditions mean that an operation row or material row should replace the previous row, or that an extra row should be added or deleted, for example for a particular customer or a certain period of time etc.
In order to use alternate preparations you must configure the setting Use alternate preparations?, under the Preparations heading that you will find under the Manufacturing tab in the Settings procedure, either to 0 or 1 before you open the preparation window. If you use alternative 1, the term columns will be visible by checking the box Show terms in the Search Form. If you use alternative 0, the term columns will be visible from the very beginning.
See also How Do Terms Affect Loading Simulation?.