how to record type

Click NEW → Record Type in Appian Designer.

Do you have any specific question, not covered by the Appian documentation?

See documentation for this.
Recommend start using appian documentation.

https://docs.appian.com/suite/help/26.7/connect-record-type-to-database.html

Perhaps take a look at this Appian Academy course: https://academy.appian.com/design-record-types-model-and-configure-your-data-1

HI ​@navenas2096 , 

1. Click on New

2.  A pop-up will appear: Name the record object

Let me know if you need anything else.