Promotional discount amount calculated using cb field

Hi

We have a sponsored subscription plan wherein a corporate sponsors the membership of "n" number of individuals.

I am capturing the number of individuals enrolled in the plan using a Radio field. I want to use this field value in the CB Promotions, using a negative discount add the additional fee per member.

Currently I am using hard-coded values in the Radio button field. For eg if the user selects 6 members an amount of 2000 is added, if he selects 7 then 4000 is added etc.. In promotions I am using the option fixed amount from CB field.

Now the data from the field stored in the DB is the amount, using which is not very meaningful for the client. I would like to use the value of 6 itself and use promotions to calculate the amount.

In promotions I noticed another option "Fixed Amount". On selecting this a field "Fixed Discount Amount in currency above" was displayed. In the info tooltip, I read Cb field substitutions can be used here.

I was wondering if I could substitute the calculation here. Eg. could I enter " ([cb_field] - 5) * 2000 " in this field. Will this calculation be accepted? If so, it would greatly help me.

Thanks

You're needing to do an actual math operation which it can not do. Best I can suggest is use CB Query Field and do your calculations using SQL then substitute in the query field. Example CB Query Field usage as follows.