The T-code for creation of standard text is SO10
there r two ways of transfering of standard text

By using standard program RSTXSCRP download/upload

or

By using standard program RSTXTRAN 
first transfer to correction, transport request is assigned 
to it.
go to T-code SE09 to transport that request.

To create standard text in SAP script, there is an option 
to insert standard text in the text element screen. click 
on insert--->text--->standard and give the text name, text 
id and language as input parameters and text object is 
always "TEXT" for standard SAP script texts. this inserts 
standard text in the script.
To transport standard text from one client to another, we 
could probably use SCC1 transaction in the target client 
and give the source client and tranport request for copying
(not sure about this).

TRANSFER Standard TEXT FROM ONE CLIENT TO ANOTHER
lets see it with an example -

i have defined a text -ZTEXT in client 100
now i want it to be copied to client 200
Goto to client 200
goto tcode so10
Utilities->Copy from client->
fill in text name =ZTEXT
text id =ST
Land=EN
source client = 100
target name = ZTEXT
and execute..
this will copy the text to client 200

Use program RSTXTCPY to Copy the text betwn clients.