I need to know how I can do CIS deductions to my app

Hi there, @rking0006-gmail-.

Creating a CIS deduction using QuickBooks Self Employed mobile app is unavailable, you can use this function via the web version instead.

On the web, you'll only need to turn it on from the Accounts and Settings page then, CIS deductions will be tracked automatically based on the CIS transactions you created.

1. Open a web browser on your mobile device.
2. Log in to your QuickBooks Online account.
3. Go to the Gear icon.
4. Under Your Company, select Accounts and Settings.
5. Select Advanced.
6. On the Construction Industry Scheme (CIS) section, click Enable CIS to turn it on.
7. Enter your CIS information.
8. Select Save.
9. Click Done.

I'm adding these helpful articles to learn more about the CIS feature in the program: 

• CIS in QuickBooks
• Already using CIS in QuickBooks?

I'll be also adding our Help articles in case you need some related references in managing your account and transactions.

Please drop a comment anytime if you need further assistance with QuickBooks. I'm always around to help. Stay safe!