I appreciate your time reaching out to us here, finance130.
The Sales - wholesale only displays the transactions with items linked to this account. If you are trying to enter an SST Registration Number, you can add it by following these steps:
Sign in to your QuickBooks Online account.
Go to the Gear > Account and Settings.
On the left panel, select Company.
In the Company name section, enter your SST Registration Number in the Sales and Service Tax ID field.
Click Save and then Done.
I've got this sample screenshot for a visual guide: