When Linking BIM Geometry to a task you have access to 3 options:

To access these options go to the task inspector then select the Model that you wish to link to the current Task. If there is no model selected the options will not be available.

To select geometry from the Search Set Filter, select the Model that you want to link then open Search Set Filter by clicking the cog next to Search Set.

In the filter menu create a filter for the geometry you wish to select. Click the "+" icon to select the geometry related to the filter then click the save button to link the geometry to the Task.

If a model is updated and you wish to refresh the filter then you are able to open the Link and refresh the filter before saving the link again.

When Linking Geometry manually, any geometry that is currently selected in the Viewport.

Geometry can be selected by either:

Hierarchy - Selecting the geometry by navigating within the BIM Hierarchy, SHIFT can and CRTL can be used to multiselct, or group select elements.

Viewport - Selecting Geometry within the viewport, a single click can be used to select a single element. Holding down SHIFT while clicking multiple elements allows you to add to your selection. Holding down SPACE allows you to marque select all elements within a bounding box.

You can use a combination of these selections to have a more refined selection.

After the Geometry you wish to add is selected click the cog next to manual Links then click save to save the selected geometry

IFC Links that come directly from an Asta Powerproject with the linking tasked being performed upstream within powerproject. These will be displayed below this section showing the geometry that is linked to the current Task.