You can create a field (J1.7+) that displays a category select box in item form and a link to the category at frontend views.
1. Create a select field
2. enable Use SQL Query
3. as Field elements enter
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SELECT id AS value, CONCAT(REPEAT('-',level),' ',title) AS text FROM `# __categories` WHERE level>0 AND extension='com_content' ORDER BY lft
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NOTE above remove space from # __
4. enable Remove space
5. as Frontend Display
select "value" instead of "text"
6. as value prefix enter:
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<a href="http:://mysite.com/index.php?option=com_flexicontent&view=category&id=
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7. as value suffix enter:
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" alt="Display category">Some text</a>
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