Using number, parts and subparts in one line.

How do i automatically write the following in LibreOffice, using numbered lists. In LaTex i used \enumerate \enumerate, while in M$ word there was listnum.

                     1. a) i) in a single line 
                            ii) in the following line 
                            iii) again another line 
                        b) and promote another level.
                        c) and maintain it this way 
                     2. then promote gain

listnum issue: tdf#44319

You seem to have asked this same question 3.5 years ago :wink: