0 - 2 of 2 tags for oracle to teradata migration

I want to form a teradata table structure for a given oracle table.
Do we have any ways to acheive this ?
Also I heard about ora2td tool which will help to acheive this. but I do not have enough details regarding this tool.
Could someone help with this. If possible please share details regarding ora2td tool.

Hello Everyone!
I'm trying to aggregate all the field values of a particular group in one field.
For example, My input table looks like :-


A 1

A 2

B 1

B 2

C 1

C 3

3 null


and my output should look like :-

1 A,B,C