You are looking at the correct area, but unfortunately when an IBA (attribute) is created in Windchill, once it exists you CANNOT modify it's type through the GUI. You also cannot modify it's internal name - only the "display name".
What you will likely need to do is create a new attribute of integer type and give it a similar, but different internal and display name. Then, you will have to create a new parameter in Creo and designate it with that IBA.
Once that is all done, you can then HIDE the "string" attribute from the object type in Windchill. While you CAN delete it, if objects exist that have data in that attribute you will end up deleting all that data!
Thus, the end result will be you'll have 2 attributes on the object type, but only one will be active with the display name you want, and the other will be hidden (you can even put "disabled" in the display name, if you wanted to, although no one would see it ideally).
I suppose in theory you COULD modify the IBA's type by direct DB modification, but I wouldn't recommend it and it wouldn't be PTC supported. Also, since "integer" is more limiting than "string", you'd have to make sure even if you updated the type correctly you'd have to go through all the data values on that attribute and make sure they are all "integer compatible".
Feel free to drop me a line if you have any other questions or would like to discuss other Windchill-related needs you may have.
