Split as row when encounter semicolon

[abraham1]

Hi All,
From the below master table, I need to split word as separate row when encounter semicolon with same name and role. 

After that, I need to match comment column from master dataset with area column of labelling dataset. If matches, same text will be placed, if not then "Other" should populate (e.g.User4). For blank it should be kept as it is.

I am not aware how to keep the data when multiple semicolon available. I just placed raw data.

data master;
length comment $ 200;
input name $ role $ comment $;
cards;
User1 clerk Oncology;Infectious disease;Cardiovascular disease;Respiratory;
User2 srclerk . 
User4 peon Oncology;Immune;
User5 manager Oncology;Neurosciences;Immunology;Infectious disease;Dermatology;Rare Diseases - Multiple Indications, Multiple Disease areas;
run;

data labelling;
input area $200.;
cards;
Immunology
Infectious disease
Dermatology
Cardiovascular disease
Rare Diseases - Multiple Indications, Multiple Disease areas
Vaccines
;
run;

My expected output

name	role	comment	flag
User1	clerk	Oncology	1
User1	clerk	Infectious disease	1
User1	clerk	Cardiovascular disease	1
User1	clerk	Other	1
User2	srclerk	.	1
User4	peon	Oncology	1
User4	peon	Other	1
User5	manager	Oncology	1
User5	manager	Neurosciences	1
User5	manager	Immunology	1
User5	manager	Infectious disease	1
User5	manager	Dermatology	1
User5	manager	Rare Diseases - Multiple Indications, Multiple Disease areas	1

[Tom]

Use a DO loop and the SCAN() function.

data have;
  infile cards truncover;
  input name :$10. role :$10. comment $200.;
cards4;
User1 clerk Oncology;Infectious disease;Cardiovascular disease;Respiratory;
User2 srclerk . 
User4 peon Oncology;Immune;
User5 manager Oncology;Neurosciences;Immunology;Infectious disease;Dermatology;Rare Diseases - Multiple Indications, Multiple Disease areas;
;;;;
data want;
  set have;
  do item=1 to max(1,countw(comment,';'));
    area = scan(comment,item,';');
    if area ne ' ' or item=1 then output;
  end;
run;

Results:

Obs    name     role       item    area

  1    User1    clerk        1     Oncology
  2    User1    clerk        2     Infectious disease
  3    User1    clerk        3     Cardiovascular disease
  4    User1    clerk        4     Respiratory
  5    User2    srclerk      1
  6    User4    peon         1     Oncology
  7    User4    peon         2     Immune
  8    User5    manager      1     Oncology
  9    User5    manager      2     Neurosciences
 10    User5    manager      3     Immunology
 11    User5    manager      4     Infectious disease
 12    User5    manager      5     Dermatology
 13    User5    manager      6     Rare Diseases - Multiple Indications, Multiple Disease areas