htermelését
htermelését is not a standard word or term in Hungarian. It appears to be a concatenation of an initial letter or prefix h- with the noun termelés and the definite-object suffix -ét. There is no widely recognized meaning or usage for this exact spelling in normative Hungarian.
The base word termelés means production or manufacturing. The form termelését is the definite direct-object variant
If you intended the common form termelését (without the leading h), or if h- was meant as