This item has been identified as an outstanding known issue. A workaround is provided until the issue is officially fixed.
Issue
In the New UX when copying a value(s) and pasting, the entire row in which the target cell(s) lies is pasted rather than the selected cells. This only occurs when using a single item which is a nested (inner) dimension. A temporary block on copy, paste and delete (using the delete key) has been introduced which will be removed once the fix has been implemented
Workaround
Pivot the dimensions of the grid so that Line Items are not the inner nested dimension.
Add a dummy item to the nested dimension to avoid the nested dimension ever having a single item
If this workaround is not suitable in your use case, please contact Support at support@anaplan.com.
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Internal Reference: DBC-1665