Use COPY and PASTE functionality or MOVE TO in the analysis you can achieve "How to create one analysis by merging all the different Analysis"
COPY and PASTE:
1)Open an analysis --> select all required nodes --->Copy the nodes. (Highlighted in RED)
2) Then navigate to the Main Analysis and Paste it. (Highlighted in RED)
Go to Pipelines-->Select the Pipeline/Analysis -->Right click on that Analysis and select Move to/Copy to/Duplicate according to the requirement.