I'm using three separate commands in this CMD file.
I'll show them separately.

1. Update the historical data

We update the data first - 20000 bars EURUSD M30

TITLE OOS Workflow - EURUSD M30

REM Fetch EURUSD M30

node .\bin\fetch.js ^
  --fx-rates      true   ^
  --symbol        EURUSD ^
  --period        M30    ^
  --max-data-bars 20000

2. Generate strategy on the first 75% of the data. ( In Sample )

Here we set "gen" to load 20000 bars of EURUSD M30 and to use from 0% to 75%
  --data-start-percent      0
  --data-end-percent        75

I'm collecting the first 300 strategies. This is different from the usual practice of running the Generator for some time and getting the collection.
  --collection-capacity     300
  --max-ascended-strategies 300

I set the Express Generator to update the best strategy on the screen (default behaviour) and not show the top strategies after the generator finishes.
  --update-best             true
  --show-top                0

I set the generator to export the collection to "Coll-In-Sample-EURUSD-M30" file.
Here  "--output-replace true" sets the generator to overwrite a previous file with the same name. This is important because I'' load the file for validation in the next section.

node .\bin\gen.js ^
  --symbol                  EURUSD ^
  --period                  M30    ^
  --max-data-bars           20000  ^
  --data-start-percent      0      ^
  --data-end-percent        75     ^
  --collection-capacity     300    ^
  --max-ascended-strategies 300    ^
  --update-best             true   ^
  --show-top                0      ^
  --output-replace          true   ^
  --output                  Coll-In-Sample-EURUSD-M30

3. Validate strategies on 25% OOS and get top 10

Here I set the Generator to load 20000 bars of EURUSD M30 but only use the latest 25%.
  --max-data-bars           20000
  --data-start-percent      75 
  --data-end-percent        100

I collect only the top 10 by setting the collection capacity to 10 strategies
  --collection-capacity     10

I want strategies with min 10 trades (100 by default)
--min-count-of-trades     10

I don't want to see the best one updated but want to see all the top 10 printed
--update-best             false
  --show-top                10   

I set the generator to work in validation mode by providing "--input" parameter
  --input                   Coll-In-Sample-EURUSD-M3
The program loads the previously generated IN sample collection

node .\bin\gen.js ^
  --symbol                  EURUSD ^
  --period                  M30    ^
  --max-data-bars           20000  ^
  --data-start-percent      75     ^
  --data-end-percent        100    ^
  --collection-capacity     10     ^
  --min-count-of-trades     10     ^
  --update-best             false  ^
  --show-top                10     ^
  --input                   Coll-In-Sample-EURUSD-M30 ^
  --output                  Coll-OOS-EURUSD-M30

This is an example of how we can use several actions to compose a workflow. I'm using the default Acceptance Criteria, but you may modify the code.