How do I record reimbursement checks received from client. These are checks covering fees I pay on their behalf.

Welcome to the QuickBooks Community, @erik-heikkenen.  

Currently, recording reimbursement in QuickBooks Self-Employed (QBSE) is not an option. In the meantime, you can record the expense transaction and once it gets reimbursed, you'll need to exclude it.  

To record an expense, here's how:

1. In the left menu, click Transactions. 
2. Click Add transaction button at the upper right hand. 
3. Enter a transaction name, amount, and category. 
4. Press Save.  

To exclude a transaction you can follow these steps: 

1. Go to the Transactions tab. 
2. Locate and check the reimbursement transaction.
3. Click the Exclude icon. 

I've added these articles to learn more about Categories in QuickBooks Self-Employed. 

Should you have further questions or concerns in QuickBooks, you can always tap the Community team. It's always our pleasure to help.