I am afraid that your question does not make sense. I suggest that you provide a lot more information about your requirements or a more specific question.
I have mapped one column using mapping function. Now I need the data of this column and another column from different table into my dashboard. So I was wondering that if we can join these two and can use the data.
Below is my understanding,
Table A contains a field which is added to Table B using Mapping Load & ApplyMap functions based on common attribute. Later you want the newly populated field to relate it with a field from Table C. To achieve this you can again perform two things:
1. Mapping Load of that field into Table C
2. Join to get the new filed in Table C using Resident Load
Hope this will help.