Question on how best to allocate payments for goods and services .

I try to clarify my question. Taking as base the demo training.co

I would ask about the best practices in this soft (which  is very good)

My question is referring to how best to do the items listed below with this F.A

Referencing system based on the demo training.co

How is the best process to charge purchases and expenses in FA ?

Story 4 types of overheads.

group1 ) Purchases of materials for production or a work made by a supplier for a product for sale.

In Iventario --> Add item 
chose -- Category : Charges 
chose -- Item Type: Purchase
Chose: Exclude from sales:
C.O.G.S. Account: 1510 Cost of Goods Sold 
Sales Account: 4010 Sales ? or  cual ?

In Purchase -->
Add Supliers
Purchase Order Entry -?
Payments to Suppliers - ?

group2 group3 group4

GENERAL AND ADMINISTRATIVE EXPENSE

we should create a category positions in Inventory or where?
The accounts are already created in the catalog of accounts, but as is the process to enter these expenses in FA?

group2), telephone, Office rent,
For the suppliers as being the landlord or power company or phone.
You have to enter them as  Supplier ?

group3) purchase and payment of consumables for the operation of the office .. (library, cleaning items) and maintenance (repairs, painting etc)

CAPITAL ASSETS

group4) Durable goods (vehicles y/or forniture ,)
We have to create these goods  in inventory? and then purchase ?
How to imput by capital assets?

Someone might suggest how to charge that expenditures on FA. One small step for each group

There is possibility to do so with Quick Entries For (payment of group2 and/or group3  )   ? How?
How is the process of procurement of goods?  group4