About Datum Feature Creation
You can create all datum feature types, including points, axes, planes, coordinate systems, curves, graphs, and analyses, by using the commands in the Datum group on the Model tab.
During feature creation, model investigation, component assembly, and other operations, you are required to select one or more datum points, axes, planes, and/or coordinate systems, but in many cases the desired datum does not exist.
You can create datum points, axes, planes (including offset planes), curves, ribbons and coordinate systems at any time. You can create these features even during the creation of another feature, and then use them as references of that feature. At any point in feature creation, measurement, or analysis, if a datum feature is needed, you can create it.
This applies even for nested datum features, such as a condition where a point, axis, and plane must be created simply to get a reference for an offset make datum.
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 Datum features, like other features, may have names that are identical to individual entity names. For example, a datum axis feature may contain an axis entity. In the former case, an axis is a type of feature, and in the latter case, it is a type of entity. Likewise, a datum point feature may contain many datum point entities. For more information about and procedures for creating datum features, see the topics under Part Modeling in the Help Table of Contents.
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