How to combine multiple samples into one MERGED group in test_manifest.yaml

[qicheng-ma]

Dear Author,

In the file test_manifest.yaml:

undemultiplexed:
forward: test/data/undemultiplexed/undemux.r1.fastq.gz
reverse: test/data/undemultiplexed/undemux.r2.fastq.gz
index1: test/data/undemultiplexed/undemux.i1.fastq.gz
index2: test/data/undemultiplexed/undemux.i2.fastq.gz

samples:
control:
target:
barcode1: CTCTCTAC
barcode2: CTCTCTAT
description: Control

EMX1:
    target: GAGTCCGAGCAGAAGAAGAANGG
    barcode1: TAGGCATG
    barcode2: TAGATCGC
    description: EMX_site1

we can only compare one sample to another sample, could you please tell me how to combine multiple samples into one MERGED group in test_manifest.yaml so that I can compare one group to another group ?

Thanks!