A CREATION QUERY related to table as input with RFC

Hi experts,

I have  a TABLE AS INPUT to an RFC which i am mapping to create odata.

for the table with fields : i have created a entity type RFCINPUT with property as :

QUERY 1: 

WHERE  should the mapping be done??  under create or getentityset(query) or update of the entity type.???

QUERY 1: 

while giving we can use $filter for single input in the URL itself.

However for multiple input as a table how to handle using rest client postman .( $batch is used i think which i have no idea about)

Cannot we JSON as an INPUT in postman.

Thanks in ADVANCE.