diff --git a/README.md b/README.md
index 4ea3f99..5e9561a 100644
--- a/README.md
+++ b/README.md
@@ -7,11 +7,18 @@ This repository contains Flow transaction scripts that the Dapper wallet will su
 ```shell
 $ bash render.sh [TEMPLATE_NAME] [NETWORK]
 ```
+or
+```shell
+$ bash all.sh [NETWORK] // loops directories
+```
+
+## Rendering Transaction Environment
 
-Check out the templates and find the one that fits your use case best. Let's say it's `create-listing`, and you'd like to render a transaction template for use on `testnet`.
+Overlay environment with each folder `<tx-name>/<network>.env` and shared `./<network>.env` both optional
 
-1. Open `create-listing/testnet.env` and fill in the missing template variables.
-2. Run the folowing command to render the template using the variables you set in `testnet.env`
+Example 
+1. Open `create-listing/testnet.env` or `./testnet.env` and fill in the missing template variables.
+2. Run the folowing command to render `testnet.env`
 ```shell
 $ bash render.sh create-listing testnet
 ```
diff --git a/all.sh b/all.sh
new file mode 100755
index 0000000..e810472
--- /dev/null
+++ b/all.sh
@@ -0,0 +1,12 @@
+#!/bin/sh
+
+# Make sure the arguments look valid
+if [ -z $1 ] || ([ $1 != "testnet" ] && [ $1 != "mainnet" ])
+then
+    echo "Usage: bash all.sh [NETWORK]"
+    exit 1
+fi
+for dir in */; do
+    DIRNAME=${dir%/}
+    /bin/bash render.sh $DIRNAME $1
+done
\ No newline at end of file
diff --git a/render.sh b/render.sh
old mode 100644
new mode 100755
index 566be95..3d7b967
--- a/render.sh
+++ b/render.sh
@@ -8,12 +8,16 @@ then
 fi
 
 # Compute paths to the .env file and the template file
-env_file="$1/$2.env"
 template_file="$1/$1.cdc.tmpl"
 output_file="$1/$1-$2.cdc"
 
-# Populate environment with values from the .env file
-export $(cat $env_file | xargs)
+# overlay model
+if test -f "$2.env"; then
+  export $(cat "$2.env" | xargs)
+fi
+if test -f "$1/$2.env"; then
+  export $(cat "$1/$2.env" | xargs)
+fi
 
 # Render the template
 envsubst < $template_file > $output_file
diff --git a/testnet.env b/testnet.env
new file mode 100644
index 0000000..af1cb59
--- /dev/null
+++ b/testnet.env
@@ -0,0 +1,11 @@
+FungibleTokenContractAddress=0x9a0766d93b6608b7
+NonFungibleTokenContractAddress=0x631e88ae7f1d7c20
+DapperUtilityCoinContractAddress=0x82ec283f88a62e65
+NFTStorefrontContractAddress=0x94b06cfca1d8a476
+PackNFTContractAddress=0x4dfd62c88d1b6462
+IPackNFTContractAddress=0x5e3c1eb7f25e3c99
+NFTContractName=
+NFTContractAddress=
+RoyaltyReceiverAddress=
+
+