Increase ZOHO CRM currency field by the amount placed under zoho forms

So I have a picklist inside of the zoho forms.

In the picklist I have 6 coresponding options. Each option has the same name as different currency fields inside zoho CRM.

It looks like this - zoho forms picklist:

Stopnie + Podstopnie

Konstrukcja

Balustrady

Malowanie na mokro

Malowanie proszkowe

Pozostałe

Besides the picklist there is also one currency field inside of zoho forms named "Wydano".

In zoho CRM each deal has 6 currency fields unique for each deal. So you will find the fields named like so:

Stopnie + Podstopnie

Konstrukcja

Balustrady

Malowanie na mokro

Malowanie proszkowe

Pozostałe

Now depending on what user selects on the pick list, after the form is submitted, I want the "wydano" field from zoho forms to be added to the corresponding field in zoho crm. This way whenever someone adds for instance additional cost to "konstruction", the cost showed in the CRM is increased. Its crutial that the currency field would increase by the amount filled by the user, not replaced.

I tried google search and chatgpt to figure this out but after 2h and no progress I ended up here.

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