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I need to assign a static IP to one device which will be used to access our ERP on cloud
Let me search for you...
I've tried doing this, but i'm still not able to ping the IP assigned
My initial reaction was, "Good for you!" But then I realized, you were asking for help.
However, I am concerned that you didn't use ANY search engine to look for: sonicwall assign static IP to device.
Because if you had, you would have seen this KB article near the very top of the search results list: https://www.sonicwall.com/support/knowledge-base/how-can-i-create-a-static-dhcp-entry-in-the-sonicwall-utm-appliance/170504925446054/
Alternatively, there is a huge repository of documentation here: https://www.sonicwall.com/support/technical-documentation/?language=English
Are you sure the device is pingable? Most software firewalls block pings by default.