Applying parameters to arrays in Revit can be challenging and typically comes with a number of warnings if not done properly.
In this BIMsmith Revit Tutorial, Pete Heibel covers the basics of a useful workflow when defining parametric arrays, including nested families, reporting/instance parameters, and constraint techniques to better handle user input.
BIMsmith is a free cloud platform for architects, designers, and building professionals to research, select, and download building product data. Search, discover, compare, and download free Revit families on BIMsmith Market, or build complete, data-rich Revit wall, floor, ceiling, and roof systems faster with BIMsmith Forge. Then, use both tools within Revit using the BIMsmith Revit Plugin.