The import process translates sub numbered bullets into letters. Please see screen shots for examples of the document in word vs. Confluence.

steps to reproduce

1. Click 'tools' -> 'Import word document'
2. Choose a word doc that contains a numbered bullet list with subsections (aka, 1, 1.1 -1.2). An example copy is attached for testing.
3. Save the document
4. Notice that 1.1 has been changed to A.