DATA & FAMILIES

Fill Parameter.

Fill parameters in bulk from a rule set: each rule writes to its own target parameter, with token formulas and a scope limited to a view or a selection.

01 · THE PROBLEM

Revit's IF() formula only runs inside the Family Editor, on that family's own parameters — there is no built-in way to write a conditional value across hundreds of elements spanning several categories in a project, and that job falls straight onto whoever on the team can script Dynamo.

3–4 h

Writing a Dynamo script for every new rule

With no project-wide conditional formula, the BIM team has to build the Dynamo nodes, test them, then maintain the graph every time a family or parameter gets renamed.

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Combining several parameters into one value means typing it by hand

Building a Mark from Level + Category + a sequence number, for instance — Revit has no built-in string-join formula, so automating it means a Dynamo String.Join node, or typing every row by hand.

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No way to know how many elements a rule will touch before running it

A Dynamo script writes straight to the model when it runs — knowing the row count in advance means bolting on a Watch node yourself, otherwise you're gambling with the whole model.

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Rules don't travel to the next project

A Dynamo script is wired to that specific file's family and parameter names — move it to another project, or rename one element, and the graph throws errors that need rebuilding almost from scratch.

02 · FEATURES

What it does

On the App Store, Parameters Package ($5/month) has a tool for joining several text parameters into one — close to Fill Parameter's token-formula idea — but it only works with Text-type values, has no AND/OR conditions to target the right elements, and tops out at Revit 2022. Beyond that narrow slice, conditional parameter filling in Revit is still Dynamo's job. Fill Parameter packages that rule engine into a no-code interface:

Rule engine

OR between groups, AND inside each condition group
Each rule writes to its own target parameter
Token formulas concatenating several source parameters
Supports string, integer, double, yes/no and ElementId storage

Scope and control

Run on the whole model, the active view or a selection
Preview how many elements each rule will touch
Save the rule set per project to repeat the run exactly

TOOL INTERFACE · RUNNING IN REVIT

Operational interface and functional overview

The interface is matched to the tool window running in Revit.

FUNCTION NOTES

Every tool follows the same structure: the real window, the functions worth knowing, and a demo video.