Sum of various formula-fields

Sum of various formula-fields

Hello there,

Im currently creating a new page layout for a CRM-module which has been set up.

In my layout I used several formula-fields, which I would like to sum up at the end of the page-layout to receive a final score.

Each formula-field refers to a multi-select-field, reads out certain strings and then returns a specific number (score).
Unfortunatelly it seems impossible to use another formula-field to sum up all the formulas (scores) to get a total sum (total score), as the failure message "Custom formula fields are not allowed in expression" appears when im using the path of other formula-fields in the formula I would like to create.

Is there a way to enable suming of formulas or solve that problem?

With best regards