quickbooks doesn't ask me to add name while recording checks to accounts payable

Why are you manually creating a check to AP? That is supposed to be Pay Bills, or it isn't AP, yet. A Bill Payment Check is not created by using Write Check, in QB.

You had to put a Payee Name on that check; that would be the Vendor.

What you are asking about is the AP Line = Source vs Target. The Source is the Payee, already. The Detail or Split Lines, for expense and items, are where you list What you just paid for, such as Office supplies or Material Goods, or Outsourced services, or quantity and cost for items. Then, you also get to decide if this is Job Tracked = relates to a specific customer:job, and separately decide, Billable or not.

You don't Pay AP as Write Check. You Buy products and services.

AP is handled using the Bills tools. Look at Vendor Menu.

No QB is not taking exact name. it shows error "this name already exists in vendor list so either enter a different selection or append a character to differentiate it from the existing name".

Payment was previously recorded as check under expense, however that was payment against an open bill. Now that check is reconciled in my books and now if i delete that check my whole year reconciliation will be dis-balance.  

FYI I have another company file in which i can see all names under customer:job and i have mentioned vendors name against AP and then adjusted as credits in bill payment stub. But in one of the company file i only see customer name so i think there must be some setting that i need to change.

Hello there, @Backoffice.

I’d be delighted to share additional information on how to make that your checks are recorded and applied accurately in QuickBooks Desktop.

If you want the check your creating to be billable, you will need to enter a name on the Customer: Job and put a check mark on Billable.

Here’s how:

1. Go to Banking.
2. Choose Write Checks.
3. Select the name of the payee or whoever the check was issued for.
4. Enter the amount of the check.

To make sure that check is applied to Accounts Payable accurately, here’s how:

1. Under the check, choose Expenses tab.
2. Choose Accounts Payables.
3. Type in the amount.
4. As for the memo, it is optional or you may enter the description.
5. Under Customer: Job, instead of adding a new name, choose from the list of the customer’s name and jobs. 
6. Put a check mark on Billable.
7. Choose Save & Close.

If you want to offset a customer’s balance with a vendor’s payment, the payee name on the check should be the vendor’s name. While under Customer: Job, it should show the customer’s name.

On the other hand, there is two common workflows to record Accounts Payable.

To track goods and services: 

Step 1: Create a purchase order
Step 2: Receive inventory
Step 3: Enter bills against inventory
Step 4: Pay bills

To pay bills:

Step 1: Enter bills
Step 2: Pay bills

 That should do it! This should able you to write checks and apply it to the proper account. Have a great day ahead!

Make a Pay Bill Check for the right function, original check #, amount and date. Delete the Write Check. Now using the most recent statement, its ending balance, one date later than that cutoff date, and ignoring the beginning balance, checkmark only your recreated entry. The beginning balance is the net of all previously cleared transactions. Your recreated transaction is the right value, but no longer has the right status, so you ignore the beginning balance when you did this type of housekeeping. Checkmark what you recreated for this mini-rec or interim reconciliation and you get a difference of zero and are back on track when the values are the same. You just fixed the transactions.