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For your "fact" table in the BMM, you should have two LTS - one for the detail level data, one for the aggregate level data.
For each of your dimension tables, you should set up a hierarchy (sorry, using standard accepted terms of objects here...not Oracle's non-standard ones....) Each dimension should have at least a "total" and "detail" level, more if there are a proper hierarchy.
Then when you set up your LTS, for the detail one - each of your eight dimensions will have content level set to the detail levels. For your aggregate LTS, on the three dimensions that aren't present, set the content level to the "total" level. I'd also set the PRIORITY GROUP so that the aggregate gets chosen first instead of the detail.
Hope this helps!