You can use the page layout feature to accomplish this. But I would also look into using the Section/Column macros, they allow for more freedom.
The problem with this is that it is not easy to 'align' the rows in the two different sections.
I have a table excertped from one page and then I am tried to created more columns for that original table were I can add more content (which cannot belong in the original table.
Yes, you can use page layouts to do this. Checkout https://confluence.atlassian.com/doc/page-layouts-columns-and-sections-275188613.html.
You can also insert section and column macros on any pages. In your case, it might be as simple as adding a new section with 3 columns and placing the tables in those columns.
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