Confusion Service or Goods

Dear Sir/Mam,

Ek Proprietor Ship firm hai Uski Koi shop nahi hai wo companies me jakar contract Leta hai Waha ke for whole year fix amount ki jab v us company me computer se related koi v problem hogi wo jakr use solve karega. and uska bill de deta hai.
on the other hand
jab koi parts kharab ho jate hai to wo naya lakar lagata hai and uska alag se bill banata hai goods ka and service charge ka.

Now ab wo Gst me Service and Goods dono ka bill banayega and sabka HSN code alag alag rahega.

and hsn code kya hoga is services ka please help.....