BODS Rule to implement

Hello Experts,

I need help regarding implementing one transformation logic in BODS. Below is the scenario

I have one source table and field associated with it F1 size 200 char, In target side I need to map it with three fields F2 (size 35 char) , F3 (size 40 char), F4 (size 40 char).  Here my target is SAP system and F1 is address type of field. So below are actual namings

F1 - House number and street (200 size)

F2 - KNA1.STRAS (35 size)

F3 - ADRC.STR_SUPPL3 (40 size)

F4- ADRC.LOCATION (40 size)

Now here is my rule -

Map As-is in F2 for first 35 character, how ever if the length is greater than 35 character, take the word after blank space and push it into the ADRC.STR_SUPPL3 and if remaining data doesn;t fit here take the values after the last blank space and push it into ADRC.LOCATION.

Suggest me the way to achive it. Thanks in advance.

Best | Deepak.