Multiple Hierarchies in one dimension - comments?

multiple hierarchies
Hi Experts,
I'd like your comments on my implementation of multiple hierarchies in one dimension.- especially if this can be done in a way that:
a) still enables users to choose the hierarchy in a dashboard prompt
b) reduces maintenance to a minimum
The dimension groups ages into several different groups like the example below:
Hierarchy1 Hierarchy2
Age......Groups........Groups.....
0........0-2...........0-5
1........0-2...........0-5
2........0-2...........0-5
3........3-5...........0-5
4........3-5...........0-5
75.......70-75.........70-80
76.......76-80.........70-80
Right now I've implemented this by defining one dimension having one hierarchy:
Total
....Hierarchy
.......Group
.........Age
The underlying logical table is based on several logical table sources (LTS) - one for each hierarchy as shown in the first example(Hierarchy1, Hierarchy2).Every LTS has a fragmentation definition filtering on values on 'hierarchy-level'.
Columns in the logical table (and of course in the underlying LTS) are:
Column               mapped to hierarchy-level
- Hierarchy          Hierarchy
- Hierarchy_id          Hierarchy
- Group          Group
- Group-id          Group
- Age               Age
Advantages:
A answers / dashboard user can select one or more hierarchies by using a dashboard prompt.
Adding a new hierarchy (a new grouping) doesn't need changes in the dimension itself
Disadvantages:
A new grouping needs manual steps to implement
- a new physical table
- a new LTS attached to the logical table (including the fragmentation content)
Thanks for your time and comments
Regards
Andy

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Is this distinction piurely logical and the same physical column is used to represent both B3 and C3?
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Generally a dimension A with multiple hierarchies B and C will work fine when you have a common lowest level D, say, which acts as the leaf level for both hierarchies of the dimension.
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A
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-----+B1
-------+B2
---------+B3
-----------+D
---+C
-----+C1
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-----------+D NOTE1: Same level/column D acts as leaf level of Hierarchy B as well as Hierarchy C. We should not use 2 different columns D1 and D2 even if they contain the same data
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+91 98403 47141

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