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Vladimir BessonovVladimir Bessonov 

how to create app/tabs. etc when using sfdx-project-cicd ?

I created unlocked package in gitlab using the template. It is cool. but now how can I continue with development? 

It is clear how to create and add LWC. 
I need to create Lighting App/Tabs/ Custom Objects. 

When I was using Sandbox and sdfx project - I could create declaratively App/Tabs/ Custom Objects and then use "git pull" command to get them in my source code. 

I understand that I still can create  App/Tabs etc in slected Sandbox (configured with VARs in gitlab). I dont have it clear how to push to production it later, even classes and triggers work in sandbox. 

in Salesforce presentation they import somehow "metadata". 
 
AbhishekAbhishek (Salesforce Developers) 
https://www.infostretch.com/blog/achieve-ci-cd-for-salesforce-applications-components-with-this-step-by-step-hack/

Check this it has step by step explanation.

If you still have an issue please log a case with salesforce so that the support team assists you.