Free shipping + coupon code

New Member
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Hi all

We are in the process of migration our store into Shopify+ This is us

We currently offer, and want to continue to offer:

1) Free shipping on all orders over $99

2) Other ad hoc discounts that are offered weekly and on special occasions

How can I make this happen. At the moment we have Free Shipping set as an automatic code applied at checkout, but then no other discounts can be applied. 

Can we make the Free Shipping coupon able to be used with others?