While extracting table data from web page same heading is repeating 2,3,4 or sometimes 10 time because of this bot only extracting the first table belongs to first heading.
Once you finish selecting all desired columns in Table
Extraction wizard, check Extract Metadata property of the activity.
It will have XML definition of the path identifying the data to be extracted for each column.
Here you can delete unwanted columns if any additionally generated.
Documentation to check if stuck anywhere.
Thanks,
Ashok 
check the thread
Their is already two or three or more tables in the existing html file so is their any possible way to extract all the table in single take?
Using single Extract Table we cannot extract multiple tables at once because every table will have different selectors.
If you want multiple tables to be extracted simultaneously, you can use Parallel activity and put Extract tables.
If required all the extracted tables into single DataTable you can use DataTable Activities and LINQ.
Thanks,
Ashok
better indicate the table using for each ui element and then inside that use extract datatble activity…which will extract all tables
cheers