LO Writer - automation & user input fields in formulae

Hello, I am a newbie for Libreoffice writer. I wish to change over from Ms Word 2010. I prepare reports for clients from a word document which I insert and then -

  1. I fill in the texts blanks by quicly jumping to predefined bookmarks by pressing F11
  2. Again, jump to locations by F11, to fill in user input data (numbers) in fields for simple math formulae/equations to obtain outputs by pressing F3.

Full document fields import from Ms word does’nt seem to be possible. I am having great diffculty in especially number 2 item and have been unsuccesful so far. . I’ve been many times through the help provided by LO. Please can anyone step by step guide me as to how this can be configured in LO writer 5.1.4.2 (64 bit On LinuxMint 18.0)
Thanks.