Question:
IS there anyway to extract a function module as a file or in sumother
form with all its interface parameters, and upload it to another SAP system.
Answer:
Yup,
However, it probably will not do you much good as a lot of standard function modules use global variables so you would have to download the entire group.
If it's not a standard function module then you may have to contend with custom data types or data elements and domains as well.
SE37->Utilities->More Utilities->Upload/Download->Download.
To upload, create the function group, create the function module and then follow the menu path above.
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Regards
R
Abap KC
SFMDR