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Ladder Logic to SAMA Logic Conversion
How to convert ladder logic to SAMA logic?

How to conversion of ladder logic to SAMA logic? We already have ready ladder logic.

SAMA logic is language in which we need to use AND, OR gate and to create the logic so DCS engineer can program according to the SAMA logic.

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Series 'contacts' in a rung are a logical AND function
Paralleled 'contacts' in a rung are a logical OR function

See pages starting at page 65 in the document at this link for ISA Boolean function block symbols:

http://avanceon.com/wp-content/uploads/2017/01/ISA-5.1-2009.pdf

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Last page (6) of this boiler controls app note shows some boolean in a SAMA diagram.

https://cache.industry.siemens.com/dl/files/624/51436624/att_75679/v1/AD353-131r2.pdf

Either format is routine in the DCS/PLC world, with a one to one equivalence. But in an operating environments, the ladder diagrams are more easily communicated. You should be able to use either interchangeably.