Select Vendor Bills with multiple Vendors WHERE Vendor Bills's Status must be POSTED and Payment Status must not be PAID.
Click on Register Payment for Multiple Vendors/Customers.
It will open a Pop-Up with selected vendor bill's Information.

Explanation:

Payment Journal : User select a Journal.
Payment Date : Today's date by default. User can change it.
Selected Partners : User can see list of Unique Vendors/Customers which selected for Mass-Registering Payments. Its Readonly field.

Wizard Lines will show Invoices Sort By Vendor/Customer of Vendor-Bill/Customer-Invoice From selected Invoices.

Details of Bills:

Partner : Vendor-Name/Customer-Name.
Number : Number of invoice.
Due Date : Due Date of related Vendor-Bill/Customer-Invoice.
Invoice Amount : Total amount of related Vendor-Bill/Customer-Invoice.
Amount Due : Due Amount of related Vendor-Bill/Customer-Invoice.
Payment Method Type : By Default It will set Manual. Its editable So User can change it. e.g Check.
Payment Amount : It will set remaining payment amount of related Vendor-Bill/Customer-Invoice. Its editable So User can change it.
Memo : Reference Or Name of related Vendor-Bill/Customer-Invoice. Its editable So User can change it.
Validate Button: If Register payments for Vendor bills, Validate Button will create Vendor payments Group By Vendors and
         Payment Method Type.
         If Register payments for Customer invoices, Validate Button will create Customer payments Group By Customers and
         Payment Method Type.

Example:

Here we selected vendor invoices of Azure Interior,Deco Addict,Lumber Inc.,Wood Corner.
After perform action Register Payment for Multiple Vendors/Customers, It will show Vendor-Bill Sort By Vendor. So use can easy see the invoice details.
Here we can see 2 Vendor-Bill of Wood Corner, 2 Vendor-Bill of Deco Addict, 4 Vendor-Bill of Azure Interior and 2 Vendor-Bill of Lumber Inc.
In BILL/2020/0002(Azure Interior vendor), We selected Payment-Method-Type as Check.
So Now when we Click Validate Button, 5 payments will create.
Lumber Inc : 1 payment will create with 28.75 PaymentAmount. SUM(BILL/2020/0007, BILL/2020/0006)
Deco Addict : 1 payment will create with 2,760.00 PaymentAmount. SUM(BILL/2020/0004, BILL/2020/0005)
Wood Corner : 1 payment will create with 3,608.13 PaymentAmount. SUM(BILL/2020/0009, BILL/2020/0008)
For Azure Interior vendor, we can see two different Payment-Method-Types So separate payments will create.
1 payment will create with 20.00 PaymentAmount WHERE Payment-Method-Type = Check. SUM(BILL/2020/0002)
1 payment will create with 671.10 PaymentAmount WHERE Payment-Method-Type = Manual. SUM(BILL/2018/0001, BILL/2020/0003, BILL/2020/0001)