mysql - storing allowed settings combinations -

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i making interface user can define settings. settings separated in categories , user can select 1 parameter each category. thing is, combinations of parameters allowed , must prevent users selecting incompatible parameters.

i trying design mysql database structure did not find solution satisfies me.

what thought of : 

categories   - id  - description  parameters  - id  - parent category id  - description  combinations  -id  - string concatenation of parameters ids ordered category

eg. : 102596 combination of parameters 10 category 1, 25 category 2, , 96 category 3.

the problems : if 1 day need more hundred parameters ?

ok have these tables:

categories   - id  - description

and each category has multiple parameters:

parameters  - id  - parent category id  - description

now want store parameters user has selected. why dont handle operation of permitting of selecting 1 parameter per category outside of database design scope? if can that, combination table simple:

combinations  - id  - user_id  - category_id  - paremeter_id

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