How can I insert identity manually?

Yes you can set identity fields manually executing

SET IDENTITY_INSERT masterTbl ON

then insert your data

INSERT INTO masterTbl (id, name) VALUES (1, 'MNO') 
......

and remember to call

SET IDENTITY_INSERT masterTbl OFF

to reenable the correct functionality

SET IDENTITY_INSERT masterTbl ON

https://docs.microsoft.com/en-us/sql/t-sql/statements/set-identity-insert-transact-sql?view=sql-server-2017

In it's simplest form, you need to temporarily allow the insertion of identity values

SET IDENTITY_INSERT masterTbl ON
INSERT INTO masterTbl (id, name) VALUES (1, 'MNO')
SET IDENTITY_INSERT masterTbl OFF

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