Hi ​@sabeel_kv thanks for your question. We are able to write dynamic blocks to AutoCAD and most of what you mention is included in this. Could you specify what you are not able to write, or control, in regards to dynamic blocks in AutoCAD? This could be a good submission on our Ideas page if we don’t already support it. Here’s the documentation: https://docs.safe.com/fme/html/FME-Form-Documentation/FME-ReadersWriters/acad/Dynamic-Block-Attributes.htm

To help us investigate further, could you provide additional information such as:

• an example output and screenshots
• sample data
• sample workspace
• version of FME 
• and, any other details!

Happy FMEing

I am trying to set these custom attributes while writing. 
FME Version: 2021.1

Hi ​@sabeel_kv looks like support for writing to Dynamic Blocks in AutoCAD was implemented in FME 2022.0 so this would mean you would need to upgrade to at least FME 2022 to perform this action. 

If you would like to learn more about working with blocks in FME, I would recommend checking out these articles on AutoCAD DWG Block Attribute Extraction and the Give your DWG some Style: using the DWGStyler, template files, blocks and more. 

Sorry for this inconvenience.