Using bookmarks in reports
If you would like to select specific members of form the list you can use Select members section of all Dimensions.
To find members you have to start typing the name of member you are looking for in search and bookmark bar. The list of members with relevant name will pop up below.
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After you have bookmarked the members they are available for selection.
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If you want have a range of members that are sorted - please use Drill into level functionality
Using bookmarks in calculated members
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In this case, you will always have correctly spelled members used in you formulae and your calculated member will work correctly.