Hello Joe Zou, You will be able to define the expression inside the Textnodes.txt file present inside the styles folder for isometrics. Below are the steps which you could try. a. Select Textnodes.txt File present inside and folder. b. Write Expression as desired in a particular format. See below image for example. FILENAME1 = $(PRJ_NAME)-$(UNIT)-PP1-ISO-$(NAME) c. Save & Close textnodes.txt file. d. Launch OpenPlant Isometrics Manager. e. Generate Isometrics and verify results in drawing tag data. See image below. Also please note that it could be able to read the attributes which are present in drawing attribute. Hope this helps! Regards Rahul Kumar
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