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Project Parameters Revit mep

The only way to add a parameter to a system family is to add it by creating what is known as a project parameter. This allows you to customize the information you want from elements within the model. Space objects can be given a lot of useful data to help make design decisions and to analyze the model performance. Project parameters make it possible to add this data to spaces and other elements that cannot be physically edited.
You can add a project parameter by clicking the Project Parameters button on the Manage tab. In the Project Parameters dialog box, you can see a list of any parameters that have been added to the project. Clicking the Add button opens the Parameter Properties dialog box, shown in Figure 6.14. This is the same dialog box as in the Family Editor, but with additional settings to
assign the parameter to a category.

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Figure 6.14
Parameter Properties dialog box for a project parameter
The settings for creating a parameter or adding a shared parameter are the same for project parameters. The only difference is the Categories section of the dialog box. This is where you can select the Revit category to which the project parameter you are creating or the shared parameter you are loading is applied in the project.
Project parameters are a great way to use shared parameters in families without having to edit each family individually. The check box in the lower-left corner indicates that the parameter will be added to all elements in the project that belong to the selected category. So, if there are parameters that you want to use on a particular category of elements, such as light fixtures, you can create the parameters as shared parameters and then load them as project parameters into your project template file. Then, whenever you load a family belonging to that category into your project, it will have the desired parameters, which can be used for scheduling or tagging.
The Categories section lists all MEP-related categories to which the parameter can be applied.
Like the Visibility/Graphic Overrides dialog box, you can select the box below the list to show all Revit categories. Project parameters can be added to multiple categories, allowing you to add information quickly to multiple objects.
Duplicate parameters

It is possible to create a project parameter with the same name and settings as a parameter that already exists in the elements to which it is being applied. This may not pose a problem for objects already loaded into your project, but keep in mind that a component may be loaded that already has
a parameter equal to one of your project parameters. Managing project parameters is as essential as managing shared parameters and content.
When you add a parameter to your project and it is applied to elements in the chosen category, the parameter will not have a value. The parameters can easily be given values by creating a schedule of the elements and including the project parameter(s) in the schedule.
Yes/No type parameters will be set to Yes (selected) by default and appear to be uneditable when they are viewed in a schedule or the properties of an element. You can click the grayedout check box once to make it editable

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