How can we see following fields in Data Services - Table Metadata window
KTEXT
LTEXT
MCTXT
It can be seen using Data Browser in SAP .
sjain 
(BOB member since 2009-04-17)
???
By opening the imported table?
Werner Daehn 
(BOB member since 2004-12-17)
We are able to see all the fieds that we can see using Data Browser in SAP except KTEXT , LTEXT, MCTXT.
Therefore, KTEXT , LTEXT, MCTXT can found in Data Services imported metadata.
sjain (BOB member since 2009-04-17)
I believe I know the misunderstanding. When you are in the tabel browser of the SAP GUI (/nse16) this transaction shows you additional columns as well. Look at the table structure of your table (/nse11), you will see there are no such columns.
example: When you view MARA, the Material Text is shown. But there is no such column in the table, the text is in the MAKT table.
Werner Daehn (BOB member since 2004-12-17)