# Multiple-Parameter Door Numbering by Room

**URL:** <https://forum.dynamobim.com/t/multiple-parameter-door-numbering-by-room/16507>\
**Category:** Revit\
**Tags:** python, dynamo, roomboundaries, rooms\
**Created:** [November 15, 2017, 10:22am UTC](https://forum.dynamobim.com/t/multiple-parameter-door-numbering-by-room/16507 "2017-11-15T10:22:10Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![SirFunkalot](https://avatars.discourse-cdn.com/v4/letter/s/3ab097/32.png) [@SirFunkalot](https://forum.dynamobim.com/u/SirFunkalot)\
**Post date:** [November 15, 2017, 10:22am UTC](https://forum.dynamobim.com/t/multiple-parameter-door-numbering-by-room/16507/1 "2017-11-15T10:22:10Z")

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Hello,  
I am quite the beginner in Dynamo, and I have recently had an interesting mission at my job, and that is to renumber all doors in a project based on the room number they open into.  
After scouring the internet for anything that can help, I found a few scripts, especially one that does exactly what I need.  
It’s from BVN and it’s called “Door.RenumberbyRoom”. It’s quite complicated deep inside, but the block itself is very easy to use, and it does exactly what I need, specifically taking the Room number parameter and applying it to the doors in a room, by rotation.  
The problem is that it chooses JUST one parameter, where I need multiple parameters. I don’t just have the room number, I also have the Stairshaft number, Level, Apartment number and then Room number. All these are Shared Parameters.  
F.eg.: “Door tag - 10.01.15.200-01” (Stairshaft 10, Level 01, Apartment 15, Room 200, Door 01…02…03)

How could I manage to make this numbering based on what I already have? I tried using the same block, and instead of Prefix to connect all these shared parameters into a “List.join” or Code block with “a+b+c+d”, but it doesn’t seem to be working.  
I feel like I am very close, and I need to practically add the CORRECT, dynamic Prefix to this whole thing.  
Here is what I have so far that doesn’t work:  
 ![Unbenannt3](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/6/2/62f7503495ac9d878e99506225b31e39357ab3ce.PNG)

I would upload the script and more images, but it won’t let me as I am a new user 😕  
Thank you so much!!!  
SirFunkalot