How to configure the cash paymebt method without reduce the stock?

hi,

i wish to sell services where online payments (CB by example) make the stock reduce and when the customer choose Cash payment, it will not reduce the stock.

CB payment : stock reducing auto
cash payment : manual stock reducing by human

Only human order validation will reduce the stock on cash payment order when the customer will come at office to pay in cash.

is this possible in Basic Plan ?

As there is no delivery, i did not finf this setting in shopify.