Uunregistered purchase & gta under rcm

I have 2 qus. 
1-we generate manual invoices where in one single invoice sometime  we charge amount for both Goods & Service so  there is any option for a single entry in tally for goods & service ?, If No than will i have to make two separate entry for goods & service?
2- in RCM Limit of Rs. 5000 per day but my Qus is if i purchase unregistered goods of Rs. 4000 in a day & take GTA Services of Rs.2000, GTA is Registered person   so will i pay gst on RCM basis only in 2000 or 4000+2000=6000 because GTA is registered & Purchase are unregistered but in both cases GST aplly on RCM Basis. so what is solutn.