Helo sam,

If you want to create navigation like this

• MainNav1
  • Sub Nav1
  • Sub Nav2
• MainNav2
  • Sub Nav1
  • Sub Nav2

Then you can create one blocklist with a property to add sub links like below.

Code:

  @inherits Umbraco.Cms.Web.Common.Views.UmbracoViewPage<Umbraco.Cms.Core.Models.Blocks.BlockListItem>
    @{

    //get the content model
        var contentModel = Model.Content as ElementHero(elementType);
    //get the settings model
        var settingsModel = Model.Settings as BlockSettings;
var subNavs=contentModel.SubNavs

    <header class="masthead @settingsModel.AdditionalClasses" style="background-image:url('@contentModel.Image.Url()')">
        <div class="container">
            <div class="title text-uppercase">@contentModel.Title</div>
            <a class="btn btn-primary btn-xl text-uppercase js-scroll-trigger" target="@contentModel.CallToActionLink.Target" href="@contentModel.CallToActionLink.Url">@contentModel.CallToActionLink.Name</a>
            <div class="subNav"> 
    @foreach(var subNavItem in subNavs) {
              <a class="btn btn-primary btn-xl text-uppercase js-scroll-trigger subnavs" target="@subNavItem.Target" href="@subNavItem.Url">@subNavItem.Name</a>
            }
 </div>
 </header> }

Doc here : https://docs.umbraco.com/umbraco-cms/fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/block-editor/block-list-editor

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