Vera, That is a pretty broad question.
What version of PPT,
Please explain more about pasting it into an "object box', Might just
be a language difference here, also it begs a lot more explanation
about what you are trying to do. I do a lot of this and am not quite
sure what you are asking. I typically format the table in XL correctly
so it will fit correctly in PPT and then just scale it to 100% of
original file size.
Using my method you can do it manually or with VBA code.

Please explain more.

Brian Reilly, MVP