Sumit's answer gives you a script field on an issue. This is a solution you've been told several times already, but ignored.
It does not happen in the workflow. If you want to calculate a field in the workflow, then you need a post function (again, something you've been told several times before).
The question that you've refused to answer in other conversations remains what you actually want from this calculation. Is a scripted field on an issue what you want? Or a field you can edit after an initial calculation is made? Or a field somewhere else?
That is not what you said on the other conversation. You said they should be read only. If you want them editable, then you need a post-function to calculate the value and put it in a field which the user can then change later. We've answered the total thing too - the navigator does not support that, you'll need an add-on.
Use calculated number field :
formula should be
<!-- @@Formula: (issue.get("customfield_XXXXX") != null ? issue.get("customfield_XXXXX") : 0) + (issue.get("customfield_XXXYZ") != null ? issue.get("customfield_XXXYZ") : 0) +(issue.get("customfield_XXXYZU") != null ? issue.get("customfield_XXXYZU") : 0) -->
it will work everywhere within JIRA [so no transition restriction will be applied]
XXXXX – ID of calculated number field which shown sum
XXXYZ – First Number field
XXXYZU – Second Number field
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