Hi everyone
I need to generate an ID automatically when I add a Company Name
Do you want to generate the ID from the company name?
In that case, you need to write a custom client script to run whenever the company name changes.
If you want to generate the ID in a running number series, then you need to write a server script to do so, or set up a naming rule if the company ID is the name of document as well.
Need more details to actually help you out 
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