in which vs to which

hello

Can anyone plese help me explain the difference betwen “in which” vs “to which”

eg.

i have a health plan in which/to which i can get reimbursed for my expenses.

i have a health plan in which/to which i may contribute 100% of my income.

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The preposition depends on the verb. They should read:

I have a health plan from which I can get reimbursed for my expenses.
I have a health plan to which I may contribute 100% of my income.

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Thanks. Just to clarify so “from” is used because I can be “reimbursed FROM” my health plan

“to” is used because I can “contribute TO” my health plan

“in” is used if I can “invest in” my health plan
(i have a health plan in which i may invest 10% of my income"

This is not so difficult when i’m writing it because i can choose the preposition to the verb i’m using but when i’m talking, it is hard to predict what verb I will be using.

It is very backwards. Don’t i choose my verb before the preposition?

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Yes, those sentences are right,and you have the right idea. As for order of choice: I suppose the verb comes first, logically-- though for us natives it all happens together without thinking-- but don’t forget that your sentences here are very formal. In the spoken language, we usually say:

I have a health plan that I can get reimbursed from for my expenses.
I have a health plan that I may contribute 100% of my income to.

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Thank you!