Merging layers
Merging layers in an image is also referred to as "flattening" an image. You can choose to merge all layers or only selected layers in an image. Merging layers decreases the memory requirements for the image. Layers are merged according to blend modes, vector data and vector text are converted to raster data, and transparent areas of the background layer are replaced with white.
You can also merge existing layers to create a new layer.
Many file formats, such as JPEG, GIF, and TIF, do not support multilayer images. When you save images to these formats, PaintShop Pro merges all layers into a single background layer. When you save to the PSD (Photoshop) format, the image maintains raster and adjustment layers, but vector layers and art media layers are converted to raster layers.
The following table describes how layer types are merged.
To merge two layers together
To merge all layers, choose Layers 
Merge Merge All (Flatten).
To merge selected layers
You can also merge selected layers by right-clicking one of the selected layers and choosing Merge Merge Selected.
To merge selected layers to a new layer
You can also merge selected layers to a new layer by right-clicking one of the selected layers and choosing Merge Merge Selected To New Layer.
To merge all visible layers
for each layer that you do not want to merge.
.
Invisible layers are not affected. The merged layer, which maintains the transparency information of the original layers, appears at the position of the active layer.
If the selected layer is in a group, only the visible layers in that group are merged. If the layer group is marked as invisible (making all layers within the group invisible), then none of the layers within the group are merged.
To merge visible layers to a new layer
to hide each layer that you do not want to merge.To merge all layers in a group