Hi @Jose L Rodriguez,
Build a Power Automate flow like below:
Use the expression to count column(number type):
add(length(triggerOutputs()?['body/choicecolumn1']),length(triggerOutputs()?['body/choicecolumn2']), length(triggerOutputs()?['body/choicecolumn3']), length(triggerOutputs()?['body/choicecolumn4']))
triggerOutputs()?['body/choicecolumn'] is selected from Dynamic Content > column name.
Test result:
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