How to assign values according to selection

[#1]

hello,

I am actually developing a application called resume search with the the help of qlikview visualization. .

I have

PRIMARY_SKILLS,

          SUBSKILLS_1,

          SUBSKILLS_2.

I want to give total 100 if only primary skills are searched and selected.

And if primary_skills and one subskills_1  is searched and selected.

The total value should be distributed as 60 to primary_skills and 40 to subskills_1.

And if the three are searched and selected the  total value should be distributed as

60 to primary_skills,

20 each to subskills_1 and subskills_2.

How to do this. Please help