Creating a new master dimension directly from the list of fields in the app is the most straightforward way. The following steps will be required:

1. While in Edit mode on the sheet of an app, navigate to your left-hand panel and open the Fields menu. In there, you will find a list of all available fields of the data model.
2. Choose the field you wish to add as a master dimension by right-clicking on it and adding it as a new dimension.
3. The following dialogue menu will pop up, where you will see the selected field added to the description. In the dialogue, you can see the whole list of dimensions on the left-hand side, and on the right-hand side, the empty attribute fields of the new dimension:

4. Enter a description which will give context to the dimension. The Description can be read by the user on the Master Item asset panel, so it is an excellent place to keep additional information and possible references to further documentation or contacts.
5. Tags are optional and utilized by the search function to identify and quickly filter the master dimensions when searching on the asset panel. While there is no cost in adding tags to it and it is helpful, the benefit is minimal, as Master Items are not introduced in masses. Each tag can contain a maximum of 31 characters, and each Master Item can have up to 30 tags. You can add tags by clicking + icon or by pressing Enter.
6. Click on the Add dimension button. Do not click on Done in the dialog, as it will take you back to the sheet and all work will be lost.