Hello Rahman,
It it's possible to copy, edit and paste by CLI commands.
You can check current configuration of EWC by "show run-config"
Below is a role part of the result for the command.
role
create "Guest" snmpid 4 1
"Guest"
filter-status enable
ulfilterap enable
apcustom disable
name "Guest"
default-cos no-change
access-control allow
traffic-mirror enable
acfilters
You can edit it as your own purpose and paste it to the CLI prompt.
Please read carefully the link below since misconfiguration could affect your network seriously.
http://documentation.extremenetworks.com/wireless/CLI/downloads/Wireless_CLI_Reference_Guide.pdf
Thank you