Combination of discount codes from a single promotion
It is currently not possible to use individual discount codes of a promotion together.
This means, for example, if you send a customer 4 individual voucher codes with a €50 discount each so that they can redeem their €200 total discount either split up or several codes together, this will not work if the individual discount codes all come from one promotion.
However, if the individual discount codes come from 4 different promotions, the customer can redeem them in combination.
This function would be a useful extension for many customers, for example by adding a button in a promotion asking whether the codes can be redeemed together. There have already been several issue tickets about this behavior in the past, as many customers do not understand why the redemption of different promotions together works, but not of a single one.

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Stefan Quisdorf commented
It should be possible to combine multiple percentage-based promotions/discounts, but a total maximum percentage value can be defined, so that, for example, no more than 50% discount can be applied in total.
For example:
10% + 10% + 10% + 10% + 10%
or
20% + 30%
or
5% + 15% + 30%So that, for example, an employee promotion (Corparate Benefifts) can be combined with a birthday voucher and a newsletter registration.
Currently, you have to exclude many promotions per promotion for each individual promotion that you create but want to restrict the combination. Defining the whole thing on the basis of the percentage value would only be a single definition of a maximum value.
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Christoph Von Heydebrand commented
This is now also a problem for us in the implementation of our new loyalty program. The customer should be able to combine several rewards (=vouchers). We don't want to prevent this, as they have really earned these rewards. We have a lot of customers with several open rewards. The vouchers are all in the same series. Also found here again: https://forum.shopware.com/t/mehrere-individuelle-gutschein-codes-der-gleichen-kampagne-gleichzeitig-einloesen/100379