Splitting the TDline text

I need help on the tdline splitting in the following format

E2EDKT2/TDLine to text field in target
Need to combine two tdlines in to one line in target and add newlline at the end

      source                                                                                  Target
1)
E2EDKT2/TDLine- line1line1line1line1             
E2EDKT2/TDLine- line2line12ine12ine2                Text- line1line1line1line1lile2line12ine12ine2 
E2EDKT2/TDLine- line3line3line13ine3                       line3line3line13ine3lile4line14ine14ine4
E2EDKT2/TDLine- line4line14ine14ine4

2)Id tdline contains blank lines inbeteeen we should ignore

3)If tdline has a text "SRR* or "INV" we should ignore that line
4)If TDline has "__________"  in between line count become 0  the we dont need to carry after the ----------------
E2EDKT2/TDLine- line15ine15ine15ine5                                      line15ine15ine15ine5
E2EDKT2/TDLine- ________________
E2EDKT2/TDLine- line6line6line6line6                                       line6line6line6line6

Thanks for your help