How to do batch processing for multiple SAR images

Hello, I’m a beginner user.
I want to generate multiple coherence images that are coregistered with 1 super-master image. I’m using Sentinel-1 SLC products. (same location, subsequent dates)
I’m following this tutorial: [HAZA08_Lebanon-Damage-Assessment.pdf (esa.int)] (https://eo4society.esa.int/wp-content/uploads/2022/01/HAZA08_Lebanon-Damage-Assessment.pdf) . The tutorial only uses one pair of images, but I wish to create multiple coherence images. aka coherence from pairs of A-B, B-C, C-D… but all coregistered with A as the super-master.

I want to know
① how can one conduct batch processing for a graph that involves two images? I’m guessing it goes either like (1,2→1,3→,) or (1,2→2,3→,) and I want the coregistration to be the former, and coherence estimation to be the latter.
② My understanding is that the write file name has to include the first input file name for the batch to work. How should I name the output for processing on two images?
③I read this post
Coregistrating more than two Sentinel-1 SLC IW products - Microwave Toolbox - STEP Forum (esa.int) From it I imagine I should create multiple pairs of coregistration. Then, proceed to the coherence estimation graph in the Lebanon tutorial:


The tutorial reads the orb stack, but I need to select only the coregistered slaves for consequtive coherence generation. How should I modify the graph?

Also, a question about master selection:
④How does the function choose a Master? I’m guessing the default be the first image.
⑤Is there a way to compute the best image to be a master?(which apparently is possible on ENVI Sarscape). In the create stack section I found and clicked ‘Find optimal reference’(I thought ‘reference file’ refers to the master but I might be wrong) but the output band indicated the first image was the master anyway.

I apologize for the bombardment of questions. I would be grateful if you could answer even a part of it.
Thank you in advance!

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Here is an example: ‘Flooding [Correlation] Map: Kalkarindji, NT Australia, 2024.’ at https://InSAR.dev Here are two sequential correlation maps that have been processed.

Hello, thank you for the information.
Is it impossible to generate multiple coherence images using batch processing in SNAP?
I’m confused, as the word coherence is not used in the example, and there’s no place to adjust parameters so I dont think correlation means coherence in this case.